Improve handling of GrPixelConfig in GrBackendTex/RT ctors

Make sure that no client facing code was relying on what we set as the
default value for fConfig by making in kUnkown.

Bug: skia:
Change-Id: Ie52ff08ba8deeacc16fe06eb0dd0c7292b2edf91
Reviewed-on: https://skia-review.googlesource.com/114261
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index 5e6473e..a7daf39 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -1422,7 +1422,6 @@
         barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
         barrier.image = image;
         barrier.subresourceRange = {VK_IMAGE_ASPECT_COLOR_BIT, 0, mipLevels, 0, 1};
-        initialLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
         VK_CALL(CmdPipelineBarrier(cmdBuffer,
                                    GrVkMemory::LayoutToPipelineStageFlags(initialLayout),
                                    VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT,
@@ -1430,6 +1429,7 @@
                                    0, nullptr,
                                    0, nullptr,
                                    1, &barrier));
+        initialLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
     }
 
     // End CommandBuffer
@@ -1498,7 +1498,9 @@
                                         &info)) {
         return {};
     }
-    return GrBackendTexture(w, h, info);
+    GrBackendTexture beTex = GrBackendTexture(w, h, info);
+    beTex.setPixelConfig(config);
+    return beTex;
 }
 
 bool GrVkGpu::isTestingOnlyBackendTexture(const GrBackendTexture& tex) const {
@@ -1541,7 +1543,9 @@
                                         &info)) {
         return {};
     }
-    return {w, h, 1, 0, info};
+    GrBackendRenderTarget beRT = {w, h, 1, 0, info};
+    beRT.setPixelConfig(config);
+    return beRT;
 }
 
 void GrVkGpu::deleteTestingOnlyBackendRenderTarget(const GrBackendRenderTarget& rt) {
diff --git a/src/gpu/vk/GrVkRenderTarget.cpp b/src/gpu/vk/GrVkRenderTarget.cpp
index 99b6b76..9c57ec0 100644
--- a/src/gpu/vk/GrVkRenderTarget.cpp
+++ b/src/gpu/vk/GrVkRenderTarget.cpp
@@ -352,8 +352,16 @@
     if (GrStencilAttachment* stencil = this->renderTargetPriv().getStencilAttachment()) {
         numStencilBits = stencil->bits();
     }
-    return GrBackendRenderTarget(this->width(), this->height(), this->numColorSamples(),
-                                 numStencilBits, fInfo);
+    GrBackendRenderTarget beRT = GrBackendRenderTarget(this->width(), this->height(),
+                                                       this->numColorSamples(), numStencilBits,
+                                                       fInfo);
+#if GR_TEST_UTILS
+    // We shouldn't have to set this since the client can't access it and we will handle the config
+    // correctly if we go through our public SkSurface APIs. However, some of our tests bypass the
+    // public APIs so we need to set this manually here.
+    beRT.setPixelConfig(this->config());
+#endif
+    return beRT;
 }
 
 const GrVkResource* GrVkRenderTarget::stencilImageResource() const {
diff --git a/src/gpu/vk/GrVkTexture.cpp b/src/gpu/vk/GrVkTexture.cpp
index 109b106..6668b8f 100644
--- a/src/gpu/vk/GrVkTexture.cpp
+++ b/src/gpu/vk/GrVkTexture.cpp
@@ -162,7 +162,14 @@
 }
 
 GrBackendTexture GrVkTexture::getBackendTexture() const {
-    return GrBackendTexture(this->width(), this->height(), fInfo);
+    GrBackendTexture beTex = GrBackendTexture(this->width(), this->height(), fInfo);
+#if GR_TEST_UTILS
+    // We shouldn't have to set this since the client can't access it and we will handle the config
+    // correctly if we go through our public SkSurface and SkImage APIs. However, some of our tests
+    // bypass the public APIs so we need to set this manually here.
+    beTex.setPixelConfig(this->config());
+#endif
+    return beTex;
 }
 
 GrVkGpu* GrVkTexture::getVkGpu() const {
diff --git a/src/gpu/vk/GrVkUtil.cpp b/src/gpu/vk/GrVkUtil.cpp
index 4f0acdb..5edb2e3 100644
--- a/src/gpu/vk/GrVkUtil.cpp
+++ b/src/gpu/vk/GrVkUtil.cpp
@@ -72,40 +72,6 @@
     return false;
 }
 
-GrPixelConfig GrVkFormatToPixelConfig(VkFormat format) {
-    switch (format) {
-        case VK_FORMAT_R8G8B8A8_UNORM:
-            return kRGBA_8888_GrPixelConfig;
-        case VK_FORMAT_B8G8R8A8_UNORM:
-            return kBGRA_8888_GrPixelConfig;
-        case VK_FORMAT_R8G8B8A8_SRGB:
-            return kSRGBA_8888_GrPixelConfig;
-        case VK_FORMAT_B8G8R8A8_SRGB:
-            return kSBGRA_8888_GrPixelConfig;
-        case VK_FORMAT_A2B10G10R10_UNORM_PACK32:
-            return kRGBA_1010102_GrPixelConfig;
-        case VK_FORMAT_R5G6B5_UNORM_PACK16:
-            return kRGB_565_GrPixelConfig;
-            break;
-        case VK_FORMAT_B4G4R4A4_UNORM_PACK16:
-            // R4G4B4A4 is not required to be supported so we actually
-            // store RGBA_4444 data as B4G4R4A4.
-            return kRGBA_4444_GrPixelConfig;
-        case VK_FORMAT_R8_UNORM:
-            return kAlpha_8_GrPixelConfig;
-        case VK_FORMAT_R32G32B32A32_SFLOAT:
-            return kRGBA_float_GrPixelConfig;
-        case VK_FORMAT_R32G32_SFLOAT:
-            return kRG_float_GrPixelConfig;
-        case VK_FORMAT_R16G16B16A16_SFLOAT:
-            return kRGBA_half_GrPixelConfig;
-        case VK_FORMAT_R16_SFLOAT:
-            return kAlpha_half_GrPixelConfig;
-        default:
-            return kUnknown_GrPixelConfig;
-    }
-}
-
 bool GrVkFormatPixelConfigPairIsValid(VkFormat format, GrPixelConfig config) {
     switch (format) {
         case VK_FORMAT_R8G8B8A8_UNORM:
diff --git a/src/gpu/vk/GrVkUtil.h b/src/gpu/vk/GrVkUtil.h
index 01688c8..b0d118a 100644
--- a/src/gpu/vk/GrVkUtil.h
+++ b/src/gpu/vk/GrVkUtil.h
@@ -32,11 +32,6 @@
  */
 bool GrPixelConfigToVkFormat(GrPixelConfig config, VkFormat* format);
 
-/**
-* Returns the GrPixelConfig for the given vulkan texture format
-*/
-GrPixelConfig GrVkFormatToPixelConfig(VkFormat format);
-
 bool GrVkFormatIsSupported(VkFormat);
 
 /**