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

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 38 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 ImageDecodedCallback& callback);
+      const ImageDecodedCallback& callback,
+      ImageDecodeCache::ImageDecodeType type);
   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:
   scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
 
  private:
   struct ImageDecodeRequest {
     ImageDecodeRequest();
     ImageDecodeRequest(ImageDecodeRequestId id,
                        const DrawImage& draw_image,
                        const ImageDecodedCallback& callback,
                        scoped_refptr<TileTask> task,
-                       bool need_unref);
+                       bool need_unref,
+                       ImageDecodeCache::ImageDecodeType decode_type);
     ImageDecodeRequest(ImageDecodeRequest&& other);
     ImageDecodeRequest(const ImageDecodeRequest& other);
     ~ImageDecodeRequest();
 
     ImageDecodeRequest& operator=(ImageDecodeRequest&& other);
     ImageDecodeRequest& operator=(const ImageDecodeRequest& other);
 
     ImageDecodeRequestId id;
     DrawImage draw_image;
     ImageDecodedCallback callback;
     scoped_refptr<TileTask> task;
     bool need_unref;
+    ImageDecodeCache::ImageDecodeType decode_type;
   };
 
   void StopWorkerTasks();
 
   // Called from the worker thread.
   void ProcessNextImageDecodeOnWorkerThread();
 
   void ImageDecodeCompleted(ImageDecodeRequestId id);
   void GenerateTasksForOrphanedRequests();
 
@@ skipping 21 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_