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

cc/tiles/decoded_image_tracker_unittest.cc

 // 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.
 
 #include <vector>
 
 #include "base/bind.h"
 #include "cc/tiles/decoded_image_tracker.h"
 #include "cc/tiles/image_controller.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 
 class TestImageController : public ImageController {
  public:
   TestImageController() : ImageController(nullptr, nullptr) {}
 
   void UnlockImageDecode(ImageDecodeRequestId id) override {
     auto it = std::find(locked_ids_.begin(), locked_ids_.end(), id);
     ASSERT_FALSE(it == locked_ids_.end());
     locked_ids_.erase(it);
   }
 
   ImageDecodeRequestId QueueImageDecode(
       sk_sp<const SkImage> image,
-      const ImageDecodedCallback& callback) override {
+      const ImageDecodedCallback& callback,
+      ImageDecodeCache::ImageDecodeType type) override {
     auto id = next_id_++;
     locked_ids_.push_back(id);
     callback.Run(id, ImageDecodeResult::SUCCESS);
     return id;
   }
 
   size_t num_locked_images() { return locked_ids_.size(); }
 
  private:
   ImageDecodeRequestId next_id_ = 1;
@@ skipping 44 matching lines @@
   EXPECT_EQ(2u, image_controller()->num_locked_images());
 
   decoded_image_tracker()->NotifyFrameFinished();
   EXPECT_EQ(1u, image_controller()->num_locked_images());
 
   decoded_image_tracker()->NotifyFrameFinished();
   EXPECT_EQ(0u, image_controller()->num_locked_images());
 }
 
 }  // namespace cc