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

cc/test/layer_tree_test.cc

 // Copyright 2011 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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/timing_function.h"
 #include "cc/base/switches.h"
 #include "cc/debug/test_context_provider.h"
 #include "cc/input/input_handler.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/test/animation_test_common.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/occlusion_tracker_test_common.h"
 #include "cc/test/tiled_layer_test_common.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gmock/include/gmock/gmock.h"
+#include "ui/gfx/frame_time.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
 
 TestHooks::TestHooks() {}
 
 TestHooks::~TestHooks() {}
 
 bool TestHooks::PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                       LayerTreeHostImpl::FrameData* frame_data,
@@ skipping 548 matching lines @@
     return;
 
   // If the LTH is not visible, defer the composite until the LTH is made
   // visible.
   if (!layer_tree_host_->visible()) {
     schedule_when_set_visible_true_ = true;
     return;
   }
 
   schedule_when_set_visible_true_ = false;
-  base::TimeTicks now = base::TimeTicks::Now();
+  base::TimeTicks now = gfx::FrameTime::Now();
   layer_tree_host_->Composite(now);
 }
 
 void LayerTreeTest::RunTest(bool threaded,
                             bool delegating_renderer,
                             bool impl_side_painting) {
   if (threaded) {
     impl_thread_.reset(new base::Thread("Compositor"));
     ASSERT_TRUE(impl_thread_->Start());
   }
@@ skipping 55 matching lines @@
 }
 
 scoped_refptr<ContextProvider> LayerTreeTest::OffscreenContextProvider() {
   if (!compositor_contexts_.get() ||
       compositor_contexts_->DestroyedOnMainThread())
     compositor_contexts_ = TestContextProvider::Create();
   return compositor_contexts_;
 }
 
 }  // namespace cc