Allow task pools to reason about transparency.

cc/resources/resource_format.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/resource_format.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 
 namespace cc {
@@ skipping 88 matching lines @@
     case LUMINANCE_8:
     case RGB_565:
     case ETC1:
     case RED_8:
       break;
   }
   NOTREACHED();
   return gfx::BufferFormat::RGBA_8888;
 }
 
+ResourceFormat BufferFormatToResourceFormat(gfx::BufferFormat format) {
+  switch (format) {
+    case gfx::BufferFormat::RGBA_8888:
+      return RGBA_8888;
+    case gfx::BufferFormat::BGRA_8888:
+      return BGRA_8888;
+    case gfx::BufferFormat::RGBA_4444:
+      return RGBA_4444;
+    case gfx::BufferFormat::ETC1:
+      return ETC1;
+    case gfx::BufferFormat::ATC:
+    case gfx::BufferFormat::ATCIA:
+    case gfx::BufferFormat::DXT1:
+    case gfx::BufferFormat::DXT5:
+    case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::BGRX_8888:
+    case gfx::BufferFormat::YUV_420:
+    case gfx::BufferFormat::YUV_420_BIPLANAR:
+    case gfx::BufferFormat::UYVY_422:
+      break;
+  }
+  NOTREACHED();
+  return RGBA_8888;
+}
+
 }  // namespace cc