cc: Adding support for RGBA_4444 tile textures

cc/layers/tiled_layer.h

Index: cc/layers/tiled_layer.h
diff --git a/cc/layers/tiled_layer.h b/cc/layers/tiled_layer.h
index 51afed2ef131189638980f8d428251531a9c0824..3870d69956be32326fc14e228241d7a66e3e9d02 100644
--- a/cc/layers/tiled_layer.h
+++ b/cc/layers/tiled_layer.h
@@ -8,6 +8,7 @@
 #include "cc/base/cc_export.h"
 #include "cc/layers/contents_scaling_layer.h"
 #include "cc/resources/layer_tiling_data.h"
+#include "cc/resources/resource_format.h"
 
 namespace cc {
 class LayerUpdater;
@@ -45,7 +46,7 @@ class CC_EXPORT TiledLayer : public ContentsScalingLayer {
 
   // Exposed to subclasses for testing.
   void SetTileSize(gfx::Size size);
-  void SetTextureFormat(unsigned texture_format) {
+  void SetTextureFormat(ResourceFormat texture_format) {
     texture_format_ = texture_format;
   }
   void SetBorderTexelOption(LayerTilingData::BorderTexelOption option);
@@ -120,7 +121,7 @@ class CC_EXPORT TiledLayer : public ContentsScalingLayer {
 
   bool IsSmallAnimatedLayer() const;
 
-  unsigned texture_format_;
+  ResourceFormat texture_format_;
   bool skips_draw_;
   bool failed_update_;