Remove some LatencyInfo merging code path

content/browser/aura/software_browser_compositor_output_surface.cc

Index: content/browser/aura/software_browser_compositor_output_surface.cc
diff --git a/content/browser/aura/software_browser_compositor_output_surface.cc b/content/browser/aura/software_browser_compositor_output_surface.cc
index 070a6365d9f48adfc83e7789e1640bf398657718..6516f93948a81fc173c19da523c1cf2921cc800f 100644
--- a/content/browser/aura/software_browser_compositor_output_surface.cc
+++ b/content/browser/aura/software_browser_compositor_output_surface.cc
@@ -35,15 +35,17 @@ SoftwareBrowserCompositorOutputSurface::
 
 void SoftwareBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
-  ui::LatencyInfo latency_info = frame->metadata.latency_info;
-  latency_info.AddLatencyNumber(
-      ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0);
-
-  base::MessageLoop::current()->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &RenderWidgetHostImpl::CompositorFrameDrawn,
-          latency_info));
+  // TODO(miletus) : Convert RenderWidgetHostImpl::CompositorFrameDrawn() to
+  // take std::vector<ui::LatencyInfo> directly so we only post the task once.

[danakj, 2013/12/20 19:27:37]

One question here, should we merge the LatencyInfo here and post once instead of
posting a bunch of times? That seems like it would match the expectations of the
old code which isn't transitioned yet. Not a big deal either way probably?

[Yufeng Shen (Slow to review), 2013/12/20 19:36:32]

It depends on what CompositorFrameDrawn() does with the the LatencyInfo.
CompositorFrameDrawn() does UMA/Telemetry metrics computation on the
LatencyInfo, which is broken currently anyway while I am doing the overhaul, so
it does not really matter.

+  for (size_t i = 0; i < frame->metadata.latency_info.size(); i++) {
+    frame->metadata.latency_info[i].AddLatencyNumber(
+        ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0);
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(
+            &RenderWidgetHostImpl::CompositorFrameDrawn,
+            frame->metadata.latency_info[i]));
+  }
 
   gfx::VSyncProvider* vsync_provider = software_device()->GetVSyncProvider();
   if (vsync_provider) {