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

ui/gfx/animation/animation_container.cc

 // Copyright (c) 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 "ui/gfx/animation/animation_container.h"
 
 #include "ui/gfx/animation/animation_container_element.h"
 #include "ui/gfx/animation/animation_container_observer.h"
+#include "ui/gfx/frame_time.h"
 
 using base::TimeDelta;
 using base::TimeTicks;
 
 namespace gfx {
 
 AnimationContainer::AnimationContainer()
-    : last_tick_time_(TimeTicks::Now()),
+    : last_tick_time_(gfx::FrameTime::Now()),
       observer_(NULL) {
 }
 
 AnimationContainer::~AnimationContainer() {
   // The animations own us and stop themselves before being deleted. If
   // elements_ is not empty, something is wrong.
   DCHECK(elements_.empty());
 }
 
 void AnimationContainer::Start(AnimationContainerElement* element) {
   DCHECK(elements_.count(element) == 0);  // Start should only be invoked if the
                                           // element isn't running.
 
   if (elements_.empty()) {
-    last_tick_time_ = TimeTicks::Now();
+    last_tick_time_ = gfx::FrameTime::Now();
     SetMinTimerInterval(element->GetTimerInterval());
   } else if (element->GetTimerInterval() < min_timer_interval_) {
     SetMinTimerInterval(element->GetTimerInterval());
   }
 
   element->SetStartTime(last_tick_time_);
   elements_.insert(element);
 }
 
 void AnimationContainer::Stop(AnimationContainerElement* element) {
@@ skipping 12 matching lines @@
   }
 }
 
 void AnimationContainer::Run() {
   // We notify the observer after updating all the elements. If all the elements
   // are deleted as a result of updating then our ref count would go to zero and
   // we would be deleted before we notify our observer. We add a reference to
   // ourself here to make sure we're still valid after running all the elements.
   scoped_refptr<AnimationContainer> this_ref(this);
 
-  TimeTicks current_time = TimeTicks::Now();
+  TimeTicks current_time = gfx::FrameTime::Now();
 
   last_tick_time_ = current_time;
 
   // Make a copy of the elements to iterate over so that if any elements are
   // removed as part of invoking Step there aren't any problems.
   Elements elements = elements_;
 
   for (Elements::const_iterator i = elements.begin();
        i != elements.end(); ++i) {
     // Make sure the element is still valid.
@@ skipping 20 matching lines @@
   Elements::const_iterator i = elements_.begin();
   min = (*i)->GetTimerInterval();
   for (++i; i != elements_.end(); ++i) {
     if ((*i)->GetTimerInterval() < min)
       min = (*i)->GetTimerInterval();
   }
   return min;
 }
 
 }  // namespace gfx