cc: Add scaling for checkered images.

cc/tiles/image_controller.h

 // Copyright 2016 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.
 
 #ifndef CC_TILES_IMAGE_CONTROLLER_H_
 #define CC_TILES_IMAGE_CONTROLLER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 37 matching lines @@
 
   // Virtual for testing.
   virtual void UnlockImageDecode(ImageDecodeRequestId id);
 
   // This function requests that the given image be decoded and locked. Once the
   // callback has been issued, it is passed an ID, which should be used to
   // unlock this image. It is up to the caller to ensure that the image is later
   // unlocked using UnlockImageDecode.
   // Virtual for testing.
   virtual ImageDecodeRequestId QueueImageDecode(
-      sk_sp<const SkImage> image,
+      const DrawImage& draw_image,
       const ImageDecodedCallback& callback);
   size_t image_cache_max_limit_bytes() const {
     return image_cache_max_limit_bytes_;
   }
 
   void SetMaxImageCacheLimitBytesForTesting(size_t bytes) {
     image_cache_max_limit_bytes_ = bytes;
   }
 
  protected:
@@ skipping 53 matching lines @@
   std::vector<ImageDecodeRequest> orphaned_decode_requests_;
 
   base::WeakPtrFactory<ImageController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageController);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_IMAGE_CONTROLLER_H_