cc: Add UMA for tracking decode duration for out of raster decodes.

cc/tiles/software_image_decode_cache.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_SOFTWARE_IMAGE_DECODE_CACHE_H_
 #define CC_TILES_SOFTWARE_IMAGE_DECODE_CACHE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 112 matching lines @@
   SoftwareImageDecodeCache(ResourceFormat format,
                            size_t locked_memory_limit_bytes);
   ~SoftwareImageDecodeCache() override;
 
   // ImageDecodeCache overrides.
   bool GetTaskForImageAndRef(const DrawImage& image,
                              const TracingInfo& tracing_info,
                              scoped_refptr<TileTask>* task) override;
   bool GetOutOfRasterDecodeTaskForImageAndRef(
       const DrawImage& image,
+      ImageDecodeType decode_type,
       scoped_refptr<TileTask>* task) override;
   void UnrefImage(const DrawImage& image) override;
   DecodedDrawImage GetDecodedImageForDraw(const DrawImage& image) override;
   void DrawWithImageFinished(const DrawImage& image,
                              const DecodedDrawImage& decoded_image) override;
   void ReduceCacheUsage() override;
   // Software doesn't keep outstanding images pinned, so this is a no-op.
   void SetShouldAggressivelyFreeResources(
       bool aggressively_free_resources) override {}
   void ClearCache() override;
@@ skipping 180 matching lines @@
   ResourceFormat format_;
   size_t max_items_in_cache_;
 
   // Used to uniquely identify DecodedImages for memory traces.
   base::AtomicSequenceNumber next_tracing_id_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_SOFTWARE_IMAGE_DECODE_CACHE_H_