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

cc/tiles/checker_image_tracker_unittest.cc

 // Copyright 2017 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/tiles/checker_image_tracker.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 29 matching lines @@
     return decodes_requested_;
   }
 
   void UnlockImageDecode(ImageDecodeRequestId id) override {
     DCHECK_EQ(locked_images_.count(id), 1U);
     locked_images_.erase(id);
   }
 
   ImageDecodeRequestId QueueImageDecode(
       sk_sp<const SkImage> image,
-      const ImageDecodedCallback& callback) override {
+      const ImageDecodedCallback& callback,
+      ImageDecodeCache::ImageDecodeType type) override {
     ImageDecodeRequestId request_id = next_image_request_id_++;
 
     decodes_requested_.insert(image->uniqueID());
     locked_images_.insert(request_id);
 
     // Post the callback asynchronously to match the behaviour in
     // ImageController.
     worker_task_runner_->PostTask(
         FROM_HERE,
         base::BindOnce(callback, request_id, ImageDecodeResult::SUCCESS));
@@ skipping 350 matching lines @@
   gfx::Size image_size = gfx::Size(partial_image.sk_image()->width(),
                                    partial_image.sk_image()->height());
   PaintImage completed_paint_image =
       PaintImage(partial_image.stable_id(), CreateDiscardableImage(image_size));
   EXPECT_FALSE(checker_image_tracker_->ShouldCheckerImage(
       completed_paint_image, WhichTree::PENDING_TREE));
 }
 
 }  // namespace
 }  // namespace cc