cc: Use HighResNow as timebase if it is fast and reliable

cc/resources/resource_update_controller.cc

 // Copyright 2012 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/resources/resource_update_controller.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "cc/resources/prioritized_resource.h"
 #include "cc/resources/resource_provider.h"
+#include "ui/gfx/frame_time.h"
 
 namespace {
 
 // Number of partial updates we allow.
 const size_t kPartialTextureUpdatesMax = 12;
 
 // Measured in seconds.
 const double kUploaderBusyTickRate = 0.001;
 
 // Number of blocking update intervals to allow.
@@ skipping 84 matching lines @@
   resource_provider_->FlushUploads();
 }
 
 void ResourceUpdateController::OnTimerFired() {
   task_posted_ = false;
   if (!UpdateMoreTexturesIfEnoughTimeRemaining())
     client_->ReadyToFinalizeTextureUpdates();
 }
 
 base::TimeTicks ResourceUpdateController::Now() const {
-  return base::TimeTicks::Now();
+  return gfx::FrameTime::Now();
 }
 
 base::TimeDelta ResourceUpdateController::UpdateMoreTexturesTime() const {
   return resource_provider_->TextureUpdateTickRate();
 }
 
 size_t ResourceUpdateController::UpdateMoreTexturesSize() const {
   return texture_updates_per_tick_;
 }
 
@@ skipping 42 matching lines @@
   if (!uploads)
     return;
 
   while (queue_->FullUploadSize() && uploads--)
     UpdateTexture(queue_->TakeFirstFullUpload());
 
   resource_provider_->FlushUploads();
 }
 
 }  // namespace cc