CC::Animations should use TimeTicks & TimeDelta to represent time

cc/trees/layer_tree_host_impl.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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 2722 matching lines @@
   }
 }
 
 void LayerTreeHostImpl::AnimateLayers(base::TimeTicks monotonic_time) {
   if (!settings_.accelerated_animation_enabled ||
       !needs_animate_layers() ||
       !active_tree_->root_layer())
     return;
 
   TRACE_EVENT0("cc", "LayerTreeHostImpl::AnimateLayers");
-
-  // TODO(ajuma): http://crbug.com/178171 - Animations use double for monotonic
-  // time.
-  double monotonic_time_for_cc_animations =
-      (monotonic_time - base::TimeTicks()).InSecondsF();
   AnimationRegistrar::AnimationControllerMap copy =
       animation_registrar_->active_animation_controllers();
   for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin();
        iter != copy.end();
        ++iter)
-    (*iter).second->Animate(monotonic_time_for_cc_animations);
+    (*iter).second->Animate(monotonic_time);
 
   SetNeedsRedraw();
 }
 
 void LayerTreeHostImpl::UpdateAnimationState(bool start_ready_animations) {
   if (!settings_.accelerated_animation_enabled ||
       !needs_animate_layers() ||
       !active_tree_->root_layer())
     return;
 
@@ skipping 308 matching lines @@
   swap_promise_monitor_.erase(monitor);
 }
 
 void LayerTreeHostImpl::NotifySwapPromiseMonitorsOfSetNeedsRedraw() {
   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
   for (; it != swap_promise_monitor_.end(); it++)
     (*it)->OnSetNeedsRedrawOnImpl();
 }
 
 }  // namespace cc