Optimize for TouchStart responsiveness

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index f5d90c62c10cfa3267f72f938a5122b6eb5c275a..a9f9a7f1c42a9327fc5197257706095d83376a10 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -20,6 +20,7 @@
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "cc/base/switches.h"
+#include "components/scheduler/renderer/renderer_scheduler.h"
 #include "content/child/appcache/appcache_dispatcher.h"
 #include "content/child/permissions/permission_dispatcher.h"
 #include "content/child/plugin_messages.h"
@@ -1144,6 +1145,10 @@ void RenderFrameImpl::OnNavigate(
     const CommonNavigationParams& common_params,
     const StartNavigationParams& start_params,
     const RequestNavigationParams& request_params) {
+  RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
+  // Can be NULL in tests.
+  if (render_thread_impl)
+      render_thread_impl->GetRendererScheduler()->OnPageLoadStarted();
   DCHECK(!base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
   TRACE_EVENT2("navigation", "RenderFrameImpl::OnNavigate", "id", routing_id_,
@@ -2795,6 +2800,7 @@ void RenderFrameImpl::didCommitProvisionalLoad(
       render_thread_impl->histogram_customizer()->
           RenderViewNavigatedToHost(GURL(GetLoadingUrl()).host(),
                                     RenderView::GetRenderViewCount());
+      render_thread_impl->GetRendererScheduler()->OnPageLoadStarted();
     }
   }