cc: Save correct frame begin time to FrameRateCounter

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index a81b31faee7c7ab1450074423422399e8ed42ac5..c8986acf2a22ad9131a5ee2601b8233d2d504a4c 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -794,16 +794,13 @@ CompositorFrameMetadata LayerTreeHostImpl::MakeCompositorFrameMetadata() const
     return metadata;
 }
 
-void LayerTreeHostImpl::drawLayers(FrameData& frame)
+void LayerTreeHostImpl::drawLayers(FrameData& frame, base::TimeTicks frameBeginTime)
 {
     TRACE_EVENT0("cc", "LayerTreeHostImpl::drawLayers");
     DCHECK(canDraw());
     DCHECK(!frame.renderPasses.empty());
 
-    // FIXME: use the frame begin time from the overall compositor scheduler.
-    // This value is currently inaccessible because it is up in Chromium's
-    // RenderWidget.
-    m_fpsCounter->saveTimeStamp(base::TimeTicks::Now());
+    m_fpsCounter->saveTimeStamp(frameBeginTime);
 
     if (m_tileManager) {
         m_memoryHistory->SaveEntry(