Add WasShown/WasHidden to RenderFrameObserver.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 4eaa8ea995b67f5047fa169fee29041c5f8365b9..45d40539391f65c2418470323f5dc482bd21ed0e 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -768,6 +768,8 @@ 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) {
@@ -778,6 +780,8 @@ void RenderWidget::OnWasShown(bool needs_repainting) {
 
   // See OnWasHidden
   SetHidden(false);
+  FOR_EACH_OBSERVER(RenderFrameImpl, render_frames_,
+                    WasShown());
 
   if (!needs_repainting)
     return;
@@ -2111,4 +2115,13 @@ 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);
+}
+
+

[jam, 2014/05/28 17:55:37]

nit: extra line

[nasko, 2014/05/28 18:26:11]

Done.

 }  // namespace content