time metric: record elapsed time from when the backgrounded and purged renderer is foregrounded unti

content/renderer/render_widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 905 matching lines @@
 bool RenderWidget::IsClosing() const {
   return host_closing_;
 }
 
 void RenderWidget::RequestScheduleAnimation() {
   scheduleAnimation();
 }
 
 void RenderWidget::UpdateVisualState() {
   GetWebWidget()->updateAllLifecyclePhases();
+  if (RenderThreadImpl* render_thread = RenderThreadImpl::current())

[esprehn, 2017/01/25 03:22:17]

How can the thread be null if we're inside UpdateVisualState() ?

[tasak, 2017/01/26 09:39:40]

I'm afraid that some unittests creates RenderWidget without any
RenderThreadImpl. However, all trybots seem to pass. I think, we don't need this
check.

Done.

+    render_thread->OnPostWidgetUpdateVisualState();
 }
 
 void RenderWidget::WillBeginCompositorFrame() {
   TRACE_EVENT0("gpu", "RenderWidget::willBeginCompositorFrame");
 
   // The UpdateTextInputState can result in further layout and possibly
   // enable GPU acceleration so they need to be called before any painting
   // is done.
   UpdateTextInputState();
   UpdateSelectionBounds();
@@ skipping 1350 matching lines @@
     // browser side (https://crbug.com/669219).
     // If there is no WebFrameWidget, then there will be no
     // InputMethodControllers for a WebLocalFrame.
     return nullptr;
   }
   return static_cast<blink::WebFrameWidget*>(GetWebWidget())
       ->getActiveWebInputMethodController();
 }
 
 }  // namespace content