Enable viewer in non-Vulkan builds

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2067023002

Review-Url: https://codereview.chromium.org/2067023002
diff --git a/gyp/most.gyp b/gyp/most.gyp
index 47c0d80..eb9f6c0 100644
--- a/gyp/most.gyp
+++ b/gyp/most.gyp
@@ -27,7 +27,6 @@
         'pathops_skpclip.gyp:*',
         'dm.gyp:dm',
         'fuzz.gyp:fuzz',
-        'viewer.gyp:viewer',
       ],
       'conditions': [
         [ 'skia_gpu == 0', {
@@ -62,8 +61,8 @@
             'skiaserve.gyp:skiaserve',
           ],
         }],
-        [ 'skia_vulkan == 0 or (skia_os != "win" and skia_os != "android")', {
-          'dependencies!': [
+        [ 'skia_os in ["win", "linux", "android"]', {
+          'dependencies': [
             'viewer.gyp:viewer',
           ],
         }],
diff --git a/gyp/viewer.gyp b/gyp/viewer.gyp
index 1013e07..0b918d7 100644
--- a/gyp/viewer.gyp
+++ b/gyp/viewer.gyp
@@ -79,6 +79,10 @@
           'sources/': [ ['exclude', '_win.(h|cpp)$'],
           ],
         }],
+	['skia_vulkan == 0', {
+	  'sources/': [ ['exclude', 'Vulkan']
+	  ],
+	}],
       ],
     },
   ],
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 7052a3a..f44e1aa 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -66,7 +66,9 @@
 
 const char *kBackendTypeStrings[sk_app::Window::kBackendTypeCount] = {
     " [OpenGL]",
+#ifdef SK_VULKAN
     " [Vulkan]",
+#endif
     " [Raster]"
 };
 
@@ -86,7 +88,7 @@
     : fCurrentMeasurement(0)
     , fDisplayStats(false)
     , fSplitScreen(false)
-    , fBackendType(sk_app::Window::kVulkan_BackendType)
+    , fBackendType(sk_app::Window::kNativeGL_BackendType)
     , fZoomCenterX(0.0f)
     , fZoomCenterY(0.0f)
     , fZoomLevel(0.0f)
@@ -102,9 +104,10 @@
 
     SkCommandLineFlags::Parse(argc, argv);
 
+#ifdef SK_VULKAN
     fBackendType = FLAGS_vulkan ? sk_app::Window::kVulkan_BackendType
                                 : sk_app::Window::kNativeGL_BackendType;
-
+#endif
     fWindow = Window::CreateNativeWindow(platformData);
     fWindow->attach(fBackendType, DisplayParams());
 
diff --git a/tools/viewer/sk_app/Window.cpp b/tools/viewer/sk_app/Window.cpp
index 7ec8baa..9d514f0 100644
--- a/tools/viewer/sk_app/Window.cpp
+++ b/tools/viewer/sk_app/Window.cpp
@@ -9,7 +9,7 @@
 
 #include "SkSurface.h"
 #include "SkCanvas.h"
-#include "VulkanWindowContext.h"
+#include "WindowContext.h"
 
 namespace sk_app {
 
diff --git a/tools/viewer/sk_app/Window.h b/tools/viewer/sk_app/Window.h
index 8b1378a..a68cbbb 100644
--- a/tools/viewer/sk_app/Window.h
+++ b/tools/viewer/sk_app/Window.h
@@ -41,7 +41,9 @@
 
     enum BackendType {
         kNativeGL_BackendType,
+#ifdef SK_VULKAN
         kVulkan_BackendType,
+#endif
         kRaster_BackendType,
 
         kLast_BackendType = kRaster_BackendType
diff --git a/tools/viewer/sk_app/android/Window_android.cpp b/tools/viewer/sk_app/android/Window_android.cpp
index 94ba9b0..60d89eb 100644
--- a/tools/viewer/sk_app/android/Window_android.cpp
+++ b/tools/viewer/sk_app/android/Window_android.cpp
@@ -7,7 +7,9 @@
 
 #include "Window_android.h"
 #include "../GLWindowContext.h"
+#ifdef SK_VULKAN
 #include "../VulkanWindowContext.h"
+#endif
 #include "../RasterWindowContext.h"
 
 namespace sk_app {
@@ -62,15 +64,17 @@
     platformData.fNativeWindow = window;
     switch (fBackendType) {
         case kNativeGL_BackendType:
+        default:
             fWindowContext = GLWindowContext::Create((void*)&platformData, fDisplayParams);
             break;
         case kRaster_BackendType:
             fWindowContext = RasterWindowContext::Create((void*)&platformData, fDisplayParams);
             break;
+#ifdef SK_VULKAN
         case kVulkan_BackendType:
-        default:
             fWindowContext = VulkanWindowContext::Create((void*)&platformData, fDisplayParams);
             break;
+#endif
     }
 }
 
diff --git a/tools/viewer/sk_app/unix/GLWindowContext_unix.cpp b/tools/viewer/sk_app/unix/GLWindowContext_unix.cpp
index 19f9731..cde1eb2 100644
--- a/tools/viewer/sk_app/unix/GLWindowContext_unix.cpp
+++ b/tools/viewer/sk_app/unix/GLWindowContext_unix.cpp
@@ -90,7 +90,6 @@
 
 void GLWindowContext_unix::onSwapBuffers() {
     if (fDisplay && fGLContext) {
-        printf("swapping\n");
         glXSwapBuffers(fDisplay, fWindow);
     }
 }
diff --git a/tools/viewer/sk_app/unix/Window_unix.cpp b/tools/viewer/sk_app/unix/Window_unix.cpp
index 431f156..c472926 100644
--- a/tools/viewer/sk_app/unix/Window_unix.cpp
+++ b/tools/viewer/sk_app/unix/Window_unix.cpp
@@ -10,7 +10,9 @@
 #include "SkUtils.h"
 #include "Timer.h"
 #include "../GLWindowContext.h"
+#ifdef SK_VULKAN
 #include "../VulkanWindowContext.h"
+#endif
 #include "Window_unix.h"
 
 extern "C" {
@@ -276,10 +278,11 @@
     platformData.fWindow = fWindow;
     platformData.fVisualInfo = fVisualInfo;
     switch (attachType) {
+#ifdef SK_VULKAN
         case kVulkan_BackendType:
             fWindowContext = VulkanWindowContext::Create((void*)&platformData, params);
             break;
-
+#endif
         case kNativeGL_BackendType:
         default:
             fWindowContext = GLWindowContext::Create((void*)&platformData, params);
diff --git a/tools/viewer/sk_app/win/Window_win.cpp b/tools/viewer/sk_app/win/Window_win.cpp
index f9762a8..03537ca 100644
--- a/tools/viewer/sk_app/win/Window_win.cpp
+++ b/tools/viewer/sk_app/win/Window_win.cpp
@@ -13,7 +13,9 @@
 
 #include "SkUtils.h"
 #include "../GLWindowContext.h"
+#ifdef SK_VULKAN
 #include "../VulkanWindowContext.h"
+#endif
 
 namespace sk_app {
 
@@ -275,10 +277,11 @@
         default:
             fWindowContext = GLWindowContext::Create((void*)&platformData, params);
             break;
-
+#ifdef SK_VULKAN
         case kVulkan_BackendType:
             fWindowContext = VulkanWindowContext::Create((void*)&platformData, params);
             break;
+#endif
     }
 
     return (SkToBool(fWindowContext));