cc: Adding support for RGBA_4444 tile textures

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 412c92b377ba27815d68bef2d9235288e5633d36..603d5e314fecf24c811c8a5f1a4c8f7d9143b9c3 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -325,6 +325,7 @@ class CC_EXPORT ResourceProvider {
   bool CanLockForWrite(ResourceId id);
 
   static GLint GetActiveTextureUnit(WebKit::WebGraphicsContext3D* context);
+  bool use_16_bit_textures() { return use_16_bit_textures_; }
 
  private:
   struct Resource {
@@ -439,6 +440,8 @@ class CC_EXPORT ResourceProvider {
 
   scoped_refptr<Fence> current_read_lock_fence_;
 
+  bool use_16_bit_textures_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };