Allow one-copy task tile worker pool to use compressed textures.

cc/resources/resource_format.cc

Index: cc/resources/resource_format.cc
diff --git a/cc/resources/resource_format.cc b/cc/resources/resource_format.cc
index e11c097b04fb53cf58fc4706ddaa7ecb60beb0a4..3a9ca8ba7c9a4f5d6e3dfa88fe03d3ba39ef1c08 100644
--- a/cc/resources/resource_format.cc
+++ b/cc/resources/resource_format.cc
@@ -28,6 +28,28 @@ SkColorType ResourceFormatToSkColorType(ResourceFormat format) {
   return kN32_SkColorType;
 }
 
+ResourceFormat SkColorTypeToResourceFormat(SkColorType color_type) {
+  switch (color_type) {
+    case kARGB_4444_SkColorType:
+      return RGBA_4444;
+    case kAlpha_8_SkColorType:
+      return ALPHA_8;
+    case kRGB_565_SkColorType:
+      return RGB_565;
+    case kRGBA_8888_SkColorType:
+      return RGBA_8888;
+    case kBGRA_8888_SkColorType:
+      return BGRA_8888;
+    case kGray_8_SkColorType:
+    case kIndex_8_SkColorType:
+    case kUnknown_SkColorType:
+      NOTREACHED();
+      break;
+  }
+  NOTREACHED();
+  return RGBA_8888;
+}
+
 int BitsPerPixel(ResourceFormat format) {
   switch (format) {
     case BGRA_8888:
@@ -97,14 +119,36 @@ gfx::BufferFormat BufferFormat(ResourceFormat format) {
       return gfx::BufferFormat::RGBA_4444;
     case RGBA_8888:
       return gfx::BufferFormat::RGBA_8888;
+    case ETC1:
+      return gfx::BufferFormat::ETC1;
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
-    case ETC1:
       break;
   }
   NOTREACHED();
   return gfx::BufferFormat::RGBA_8888;
 }
 
+bool IsResourceFormatCompressed(ResourceFormat format) {
+  return format == ETC1;
+}
+
+bool DoesResourceFormatSupportAlpha(ResourceFormat format) {
+  switch (format) {
+    case RGBA_4444:
+    case RGBA_8888:
+    case BGRA_8888:
+    case ALPHA_8:
+      return true;
+    case LUMINANCE_8:
+    case RGB_565:
+    case ETC1:
+    case RED_8:
+      return false;
+  }
+  NOTREACHED();
+  return false;
+}
+
 }  // namespace cc