Add new latency_info for tracking browser composite time.

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index bc2709c3eef96c96b196d7012befbf414dd5a6a1..e7a1d3c0e05dabd0c8b3fb91ae58e1ee503f867c 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -66,6 +66,11 @@ class OutputSurfaceWithoutParent : public cc::OutputSurface {
   }
 
   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE {
+    for (size_t i = 0; i < frame->metadata.latency_info.size(); i++) {
+      frame->metadata.latency_info[i].AddLatencyNumber(
+          ui::INPUT_EVENT_BROWSER_SWAP_BUFFER_COMPONENT, 0, 0);
+    }
+
     content::ContextProviderCommandBuffer* provider_command_buffer =
         static_cast<content::ContextProviderCommandBuffer*>(
             context_provider_.get());