Make LayerTreeHost::animateLayers take a wall clock time in addition to a monotonic time

cc/layer_tree_host.cc

Index: cc/layer_tree_host.cc
diff --git a/cc/layer_tree_host.cc b/cc/layer_tree_host.cc
index 008e251bf33cb05a299c1bd7f3708819c2c591ba..d834164d80e1eea77f66df49b4371272649f5371 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -218,11 +218,11 @@ void LayerTreeHost::didBeginFrame()
     m_client->didBeginFrame();
 }
 
-void LayerTreeHost::updateAnimations(base::TimeTicks frameBeginTime)
+void LayerTreeHost::updateAnimations(base::TimeTicks monotonicFrameBeginTime, base::Time wallClockFrameBeginTime)
 {
     m_animating = true;
-    m_client->animate((frameBeginTime - base::TimeTicks()).InSecondsF());
-    animateLayers(frameBeginTime);
+    m_client->animate((monotonicFrameBeginTime - base::TimeTicks()).InSecondsF());
+    animateLayers(monotonicFrameBeginTime, wallClockFrameBeginTime);
     m_animating = false;
 
     m_renderingStats.numAnimationFrames++;
@@ -821,18 +821,18 @@ void LayerTreeHost::setDeviceScaleFactor(float deviceScaleFactor)
     setNeedsCommit();
 }
 
-void LayerTreeHost::animateLayers(base::TimeTicks time)
+void LayerTreeHost::animateLayers(base::TimeTicks monotonicTime, base::Time wallClockTime)
 {
     if (!m_settings.acceleratedAnimationEnabled || m_animationRegistrar->active_animation_controllers().empty())
         return;
 
     TRACE_EVENT0("cc", "LayerTreeHostImpl::animateLayers");
 
-    double monotonicTime = (time - base::TimeTicks()).InSecondsF();
+    double monotonicTimeInSeconds = (monotonicTime - base::TimeTicks()).InSecondsF();
 
     AnimationRegistrar::AnimationControllerMap copy = m_animationRegistrar->active_animation_controllers();
     for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin(); iter != copy.end(); ++iter)
-        (*iter).second->animate(monotonicTime, 0);
+        (*iter).second->animate(monotonicTimeInSeconds, 0);
 }
 
 void LayerTreeHost::setAnimationEventsRecursive(const AnimationEventsVector& events, Layer* layer, base::Time wallClockTime)