Revert "Always include public/include headers for vulkan and just guard src files with SK_VULKAN."

This reverts commit 6e2d607334cc57c22e3a52179743763828ea84b2.

Reason for revert: chrome roll

Original change's description:
> Always include public/include headers for vulkan and just guard src files with SK_VULKAN.
> 
> This should allow a client to build a skia library that doesn't use vulkan but still
> has all the public headers defined so that they don't have to build two versions of
> their code.
> 
> Bug: chromium:862144
> Change-Id: I0eecbe0bc48123619f217e2cf318eb9a8c77ccb2
> Reviewed-on: https://skia-review.googlesource.com/158661
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,cblume@chromium.org

Change-Id: I76ae6f435333755fa5d546fc1e5999a324b4fd05
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:862144
Reviewed-on: https://skia-review.googlesource.com/c/159000
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 886c275..3e8b240 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1362,8 +1362,8 @@
       deps += [ "//third_party/angle2" ]
       sources += [ "tools/gpu/gl/angle/GLTestContext_angle.cpp" ]
     }
-    public_include_dirs += [ "third_party/vulkan" ]
     if (skia_use_vulkan) {
+      public_include_dirs += [ "third_party/vulkan" ]
       sources += [ "tools/gpu/vk/VkTestContext.cpp" ]
       sources += [ "tools/gpu/vk/VkTestUtils.cpp" ]
       if (defined(skia_moltenvk_path) && skia_moltenvk_path != "") {
diff --git a/include/gpu/GrBackendSemaphore.h b/include/gpu/GrBackendSemaphore.h
index 828cdcb..5c41532 100644
--- a/include/gpu/GrBackendSemaphore.h
+++ b/include/gpu/GrBackendSemaphore.h
@@ -11,7 +11,10 @@
 #include "GrTypes.h"
 
 #include "gl/GrGLTypes.h"
+
+#ifdef SK_VULKAN
 #include "vk/GrVkTypes.h"
+#endif
 
 /**
  * Wrapper class for passing into and receiving data from Ganesh about a backend semaphore object.
@@ -28,15 +31,13 @@
         fIsInitialized = true;
     }
 
+#ifdef SK_VULKAN
     void initVulkan(VkSemaphore semaphore) {
         fBackend = kVulkan_GrBackend;
         fVkSemaphore = semaphore;
-#ifdef SK_VULKAN
         fIsInitialized = true;
-#else
-        fIsInitialized = false;
-#endif
     }
+#endif
 
     bool isInitialized() const { return fIsInitialized; }
 
@@ -47,18 +48,22 @@
         return fGLSync;
     }
 
+#ifdef SK_VULKAN
     VkSemaphore vkSemaphore() const {
         if (!fIsInitialized || kVulkan_GrBackend != fBackend) {
             return VK_NULL_HANDLE;
         }
         return fVkSemaphore;
     }
+#endif
 
 private:
     GrBackend fBackend;
     union {
         GrGLsync    fGLSync;
+#ifdef SK_VULKAN
         VkSemaphore fVkSemaphore;
+#endif
     };
     bool fIsInitialized;
 };
diff --git a/include/gpu/GrBackendSurface.h b/include/gpu/GrBackendSurface.h
index e0db0a4..8caebb8 100644
--- a/include/gpu/GrBackendSurface.h
+++ b/include/gpu/GrBackendSurface.h
@@ -11,10 +11,13 @@
 #include "GrTypes.h"
 #include "gl/GrGLTypes.h"
 #include "mock/GrMockTypes.h"
+
+#ifdef SK_VULKAN
 #include "vk/GrVkTypes.h"
 #include "../private/GrVkTypesPriv.h"
 
 class GrVkImageLayout;
+#endif
 
 #ifdef SK_METAL
 #include "mtl/GrMtlTypes.h"
@@ -47,9 +50,11 @@
         return GrBackendFormat(format, target);
     }
 
+#ifdef SK_VULKAN
     static GrBackendFormat MakeVk(VkFormat format) {
         return GrBackendFormat(format);
     }
+#endif
 
 #ifdef SK_METAL
     static GrBackendFormat MakeMtl(GrMTLPixelFormat format) {
@@ -68,9 +73,11 @@
     const GrGLenum* getGLFormat() const;
     const GrGLenum* getGLTarget() const;
 
+#ifdef SK_VULKAN
     // If the backend API is Vulkan, this returns a pointer to a VkFormat. Otherwise
     // it returns nullptr
     const VkFormat* getVkFormat() const;
+#endif
 
 #ifdef SK_METAL
     // If the backend API is Metal, this returns a pointer to a GrMTLPixelFormat. Otherwise
@@ -88,7 +95,9 @@
 private:
     GrBackendFormat(GrGLenum format, GrGLenum target);
 
+#ifdef SK_VULKAN
     GrBackendFormat(const VkFormat vkFormat);
+#endif
 
 #ifdef SK_METAL
     GrBackendFormat(const GrMTLPixelFormat mtlFormat);
@@ -104,7 +113,9 @@
             GrGLenum fTarget; // GL_TEXTURE_2D, GL_TEXTURE_EXTERNAL or GL_TEXTURE_RECTANGLE
             GrGLenum fFormat; // the sized, internal format of the GL resource
         } fGL;
+#ifdef SK_VULKAN
         VkFormat         fVkFormat;
+#endif
 #ifdef SK_METAL
         GrMTLPixelFormat fMtlFormat;
 #endif
@@ -123,9 +134,11 @@
                      GrMipMapped,
                      const GrGLTextureInfo& glInfo);
 
+#ifdef SK_VULKAN
     GrBackendTexture(int width,
                      int height,
                      const GrVkImageInfo& vkInfo);
+#endif
 
 #ifdef SK_METAL
     GrBackendTexture(int width,
@@ -154,6 +167,7 @@
     // pointer and returns true. Otherwise returns false if the backend API is not GL.
     bool getGLTextureInfo(GrGLTextureInfo*) const;
 
+#ifdef SK_VULKAN
     // If the backend API is Vulkan, copies a snapshot of the GrVkImageInfo struct into the passed
     // in pointer and returns true. This snapshot will set the fImageLayout to the current layout
     // state. Otherwise returns false if the backend API is not Vulkan.
@@ -162,6 +176,7 @@
     // Anytime the client changes the VkImageLayout of the VkImage captured by this
     // GrBackendTexture, they must call this function to notify Skia of the changed layout.
     void setVkImageLayout(VkImageLayout);
+#endif
 
 #ifdef SK_METAL
     // If the backend API is Metal, copies a snapshot of the GrMtlTextureInfo struct into the passed
@@ -203,11 +218,11 @@
 
     GrPixelConfig config() const { return fConfig; }
 
+#ifdef SK_VULKAN
    // Requires friending of GrVkGpu (done above already)
    sk_sp<GrVkImageLayout> getGrVkImageLayout() const;
 
    friend class GrVkTexture;
-#ifdef SK_VULKAN
    GrBackendTexture(int width,
                     int height,
                     const GrVkImageInfo& vkInfo,
@@ -226,7 +241,9 @@
 
     union {
         GrGLTextureInfo fGLInfo;
+#ifdef SK_VULKAN
         GrVkBackendSurfaceInfo fVkInfo;
+#endif
 #ifdef SK_METAL
         GrMtlTextureInfo fMtlInfo;
 #endif
@@ -246,6 +263,7 @@
                           int stencilBits,
                           const GrGLFramebufferInfo& glInfo);
 
+#ifdef SK_VULKAN
     /** Deprecated, use version that does not take stencil bits. */
     GrBackendRenderTarget(int width,
                           int height,
@@ -253,6 +271,7 @@
                           int stencilBits,
                           const GrVkImageInfo& vkInfo);
     GrBackendRenderTarget(int width, int height, int sampleCnt, const GrVkImageInfo& vkInfo);
+#endif
 
 #ifdef SK_METAL
     GrBackendRenderTarget(int width,
@@ -282,6 +301,7 @@
     // in pointer and returns true. Otherwise returns false if the backend API is not GL.
     bool getGLFramebufferInfo(GrGLFramebufferInfo*) const;
 
+#ifdef SK_VULKAN
     // If the backend API is Vulkan, copies a snapshot of the GrVkImageInfo struct into the passed
     // in pointer and returns true. This snapshot will set the fImageLayout to the current layout
     // state. Otherwise returns false if the backend API is not Vulkan.
@@ -290,6 +310,7 @@
     // Anytime the client changes the VkImageLayout of the VkImage captured by this
     // GrBackendRenderTarget, they must call this function to notify Skia of the changed layout.
     void setVkImageLayout(VkImageLayout);
+#endif
 
 #ifdef SK_METAL
     // If the backend API is Metal, copies a snapshot of the GrMtlTextureInfo struct into the passed
@@ -327,12 +348,14 @@
     friend class GrMtlGpu;
     GrPixelConfig config() const { return fConfig; }
 
+#ifdef SK_VULKAN
    // Requires friending of GrVkGpu (done above already)
    sk_sp<GrVkImageLayout> getGrVkImageLayout() const;
 
    friend class GrVkRenderTarget;
    GrBackendRenderTarget(int width, int height, int sampleCnt, const GrVkImageInfo& vkInfo,
                          sk_sp<GrVkImageLayout> layout);
+#endif
 
     // Free and release and resources being held by the GrBackendTexture.
     void cleanup();
@@ -349,7 +372,9 @@
 
     union {
         GrGLFramebufferInfo fGLInfo;
+#ifdef SK_VULKAN
         GrVkBackendSurfaceInfo fVkInfo;
+#endif
 #ifdef SK_METAL
         GrMtlTextureInfo fMtlInfo;
 #endif
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 7fd76bc..c22705d 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -63,8 +63,10 @@
     static sk_sp<GrContext> MakeGL(const GrContextOptions&);
     static sk_sp<GrContext> MakeGL();
 
+#ifdef SK_VULKAN
     static sk_sp<GrContext> MakeVulkan(const GrVkBackendContext&, const GrContextOptions&);
     static sk_sp<GrContext> MakeVulkan(const GrVkBackendContext&);
+#endif
 
 #ifdef SK_METAL
     /**
diff --git a/include/gpu/vk/GrVkDefines.h b/include/gpu/vk/GrVkDefines.h
index e8bb63b..d30615e 100644
--- a/include/gpu/vk/GrVkDefines.h
+++ b/include/gpu/vk/GrVkDefines.h
@@ -11,8 +11,12 @@
 
 #include "SkTypes.h"
 
+#ifdef SK_VULKAN
+
 #ifndef VULKAN_H_
 #include "../../../third_party/vulkan/SkiaVulkan.h"
 #endif
 
 #endif
+
+#endif
diff --git a/src/gpu/GrBackendSurface.cpp b/src/gpu/GrBackendSurface.cpp
index 0e6df50..7e10cb2 100644
--- a/src/gpu/GrBackendSurface.cpp
+++ b/src/gpu/GrBackendSurface.cpp
@@ -39,13 +39,10 @@
     return nullptr;
 }
 
+#ifdef SK_VULKAN
 GrBackendFormat::GrBackendFormat(VkFormat vkFormat)
         : fBackend(kVulkan_GrBackend)
-#ifdef SK_VULKAN
         , fValid(true)
-#else
-        ,fValid(false)
-#endif
         , fVkFormat(vkFormat) {
 }
 
@@ -55,6 +52,7 @@
     }
     return nullptr;
 }
+#endif
 
 #ifdef SK_METAL
 GrBackendFormat::GrBackendFormat(GrMTLPixelFormat mtlFormat)
@@ -84,17 +82,13 @@
     return nullptr;
 }
 
+#ifdef SK_VULKAN
 GrBackendTexture::GrBackendTexture(int width,
                                    int height,
                                    const GrVkImageInfo& vkInfo)
-#ifdef SK_VULKAN
         : GrBackendTexture(width, height, vkInfo,
                            sk_sp<GrVkImageLayout>(new GrVkImageLayout(vkInfo.fImageLayout))) {}
-#else
-        : fIsValid(false) {}
-#endif
 
-#ifdef SK_VULKAN
 GrBackendTexture::GrBackendTexture(int width,
                                    int height,
                                    const GrVkImageInfo& vkInfo,
@@ -179,11 +173,11 @@
         case kOpenGL_GrBackend:
             fGLInfo = that.fGLInfo;
             break;
-        case kVulkan_GrBackend:
 #ifdef SK_VULKAN
+        case kVulkan_GrBackend:
             fVkInfo.assign(that.fVkInfo, this->isValid());
-#endif
             break;
+#endif
 #ifdef SK_METAL
         case kMetal_GrBackend:
             fMtlInfo = that.fMtlInfo;
@@ -199,39 +193,28 @@
     return *this;
 }
 
-bool GrBackendTexture::getVkImageInfo(GrVkImageInfo* outInfo) const {
 #ifdef SK_VULKAN
+bool GrBackendTexture::getVkImageInfo(GrVkImageInfo* outInfo) const {
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         *outInfo = fVkInfo.snapImageInfo();
         return true;
     }
-#endif
     return false;
 }
 
 void GrBackendTexture::setVkImageLayout(VkImageLayout layout) {
-#ifdef SK_VULKAN
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         fVkInfo.setImageLayout(layout);
     }
-#endif
 }
 
-// We need a stubbed version of GrVkImageLayout for non vulkan builds
-#ifndef SK_VULKAN
-class GrVkImageLayout : public SkRefCnt {
-    GrVkImageLayout(VkImageLayout layout) {}
-};
-#endif
-
 sk_sp<GrVkImageLayout> GrBackendTexture::getGrVkImageLayout() const {
-#ifdef SK_VULKAN
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         return fVkInfo.getGrVkImageLayout();
     }
-#endif
     return nullptr;
 }
+#endif
 
 #ifdef SK_METAL
 bool GrBackendTexture::getMtlTextureInfo(GrMtlTextureInfo* outInfo) const {
@@ -301,6 +284,7 @@
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+#ifdef SK_VULKAN
 GrBackendRenderTarget::GrBackendRenderTarget(int width,
                                              int height,
                                              int sampleCnt,
@@ -315,14 +299,9 @@
                                              int height,
                                              int sampleCnt,
                                              const GrVkImageInfo& vkInfo)
-#ifdef SK_VULKAN
         : GrBackendRenderTarget(width, height, sampleCnt, vkInfo,
                                 sk_sp<GrVkImageLayout>(new GrVkImageLayout(vkInfo.fImageLayout))) {}
-#else
-        : fIsValid(false) {}
-#endif
 
-#ifdef SK_VULKAN
 GrBackendRenderTarget::GrBackendRenderTarget(int width,
                                              int height,
                                              int sampleCnt,
@@ -413,11 +392,11 @@
         case kOpenGL_GrBackend:
             fGLInfo = that.fGLInfo;
             break;
-        case kVulkan_GrBackend:
 #ifdef SK_VULKAN
+        case kVulkan_GrBackend:
             fVkInfo.assign(that.fVkInfo, this->isValid());
-#endif
             break;
+#endif
 #ifdef SK_METAL
         case kMetal_GrBackend:
             fMtlInfo = that.fMtlInfo;
@@ -433,32 +412,28 @@
     return *this;
 }
 
-bool GrBackendRenderTarget::getVkImageInfo(GrVkImageInfo* outInfo) const {
 #ifdef SK_VULKAN
+bool GrBackendRenderTarget::getVkImageInfo(GrVkImageInfo* outInfo) const {
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         *outInfo = fVkInfo.snapImageInfo();
         return true;
     }
-#endif
     return false;
 }
 
 void GrBackendRenderTarget::setVkImageLayout(VkImageLayout layout) {
-#ifdef SK_VULKAN
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         fVkInfo.setImageLayout(layout);
     }
-#endif
 }
 
 sk_sp<GrVkImageLayout> GrBackendRenderTarget::getGrVkImageLayout() const {
-#ifdef SK_VULKAN
     if (this->isValid() && kVulkan_GrBackend == fBackend) {
         return fVkInfo.getGrVkImageLayout();
     }
-#endif
     return nullptr;
 }
+#endif
 
 #ifdef SK_METAL
 bool GrBackendRenderTarget::getMtlTextureInfo(GrMtlTextureInfo* outInfo) const {
diff --git a/src/gpu/GrDirectContext.cpp b/src/gpu/GrDirectContext.cpp
index 59b984c..14133cd 100644
--- a/src/gpu/GrDirectContext.cpp
+++ b/src/gpu/GrDirectContext.cpp
@@ -147,19 +147,14 @@
     return context;
 }
 
-sk_sp<GrContext> GrContext::MakeVulkan(const GrVkBackendContext& backendContext) {
 #ifdef SK_VULKAN
+sk_sp<GrContext> GrContext::MakeVulkan(const GrVkBackendContext& backendContext) {
     GrContextOptions defaultOptions;
     return MakeVulkan(backendContext, defaultOptions);
-#else
-    return nullptr;
-#endif
 }
 
 sk_sp<GrContext> GrContext::MakeVulkan(const GrVkBackendContext& backendContext,
                                        const GrContextOptions& options) {
-#ifdef SK_VULKAN
-    GrContextOptions defaultOptions;
     sk_sp<GrContext> context(new GrDirectContext(kVulkan_GrBackend));
 
     context->fGpu = GrVkGpu::Make(backendContext, options, context.get());
@@ -172,10 +167,8 @@
         return nullptr;
     }
     return context;
-#else
-    return nullptr;
-#endif
 }
+#endif
 
 #ifdef SK_METAL
 sk_sp<GrContext> GrContext::MakeMetal(void* device, void* queue) {