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

cc/thread_proxy.cc

Index: cc/thread_proxy.cc
diff --git a/cc/thread_proxy.cc b/cc/thread_proxy.cc
index 6979a1528265c5a517b49a9d0f9e22005c0dbe15..9824043837e2b028631f55e74ee1fbc99f6618bb 100644
--- a/cc/thread_proxy.cc
+++ b/cc/thread_proxy.cc
@@ -527,6 +527,7 @@ void ThreadProxy::scheduledActionBeginFrame()
     TRACE_EVENT0("cc", "ThreadProxy::scheduledActionBeginFrame");
     scoped_ptr<BeginFrameAndCommitState> beginFrameState(new BeginFrameAndCommitState);
     beginFrameState->monotonicFrameBeginTime = base::TimeTicks::Now();
+    beginFrameState->wallClockFrameBeginTime = base::Time::Now();
     beginFrameState->scrollInfo = m_layerTreeHostImpl->processScrollDeltas();
     beginFrameState->implTransform = m_layerTreeHostImpl->implTransform();
     DCHECK_GT(m_layerTreeHostImpl->memoryAllocationLimitBytes(), 0u);
@@ -586,7 +587,7 @@ void ThreadProxy::beginFrame(scoped_ptr<BeginFrameAndCommitState> beginFrameStat
     m_layerTreeHost->willBeginFrame();
 
     if (beginFrameState)
-        m_layerTreeHost->updateAnimations(beginFrameState->monotonicFrameBeginTime);
+        m_layerTreeHost->updateAnimations(beginFrameState->monotonicFrameBeginTime, beginFrameState->wallClockFrameBeginTime);
 
     // Unlink any backings that the impl thread has evicted, so that we know to re-paint
     // them in updateLayers.