Remaining code for basic tile compression functionality.

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"
 
 namespace cc {
 
 SkColorType ResourceFormatToSkColorType(ResourceFormat format) {
   switch (format) {
     case RGBA_4444:
       return kARGB_4444_SkColorType;
     case RGBA_8888:
     case BGRA_8888:
       return kN32_SkColorType;
     case ETC1:
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
     case RED_8:
       NOTREACHED();
       break;
   }
   NOTREACHED();
   return kN32_SkColorType;
 }
 
+bool IsResourceFormatCompressed(ResourceFormat format) {
+  return format == ETC1;
+}
+
 }  // namespace cc