Add WasShown/WasHidden to RenderFrameObserver.

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 "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 750 matching lines @@
     return;
   resizer_rect_ = resizer_rect;
   if (webwidget_)
     webwidget_->didChangeWindowResizerRect();
 }
 
 void RenderWidget::OnWasHidden() {
   TRACE_EVENT0("renderer", "RenderWidget::OnWasHidden");
   // Go into a mode where we stop generating paint and scrolling events.
   SetHidden(true);
+  FOR_EACH_OBSERVER(RenderFrameImpl, render_frames_,
+                    WasHidden());
 }
 
 void RenderWidget::OnWasShown(bool needs_repainting) {
   TRACE_EVENT0("renderer", "RenderWidget::OnWasShown");
   // During shutdown we can just ignore this message.
   if (!webwidget_)
     return;
 
   // See OnWasHidden
   SetHidden(false);
+  FOR_EACH_OBSERVER(RenderFrameImpl, render_frames_,
+                    WasShown());
 
   if (!needs_repainting)
     return;
 
   // Generate a full repaint.
   if (compositor_)
     compositor_->SetNeedsForcedRedraw();
   scheduleComposite();
 }
 
@@ skipping 1326 matching lines @@
 }
 
 void RenderWidget::RegisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.RemoveObserver(frame);
 }
 
+void RenderWidget::RegisterRenderFrame(RenderFrameImpl* frame) {
+  render_frames_.AddObserver(frame);
+}
+
+void RenderWidget::UnregisterRenderFrame(RenderFrameImpl* frame) {
+  render_frames_.RemoveObserver(frame);
+}
+
 #if defined(VIDEO_HOLE)
 void RenderWidget::RegisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.RemoveObserver(frame);
 }
 #endif  // defined(VIDEO_HOLE)
 
 }  // namespace content