Fire visibilityChange event on out-of-process iframes.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index a2675f253887269433cd67a2c3de5d07fae84b53..59057e45326cad71746d650bc582626d57faabbd 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -43,6 +43,7 @@
 #include "third_party/WebKit/public/platform/WebFocusType.h"
 #include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
+#include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
 #include "third_party/WebKit/public/platform/modules/app_banner/WebAppBannerClient.h"
 #include "third_party/WebKit/public/web/WebAXObject.h"
 #include "third_party/WebKit/public/web/WebDataSource.h"
@@ -615,6 +616,7 @@ class CONTENT_EXPORT RenderFrameImpl
       const blink::WebSecurityOrigin& security_origin,
       blink::WebSetSinkIdCallbacks* web_callbacks) override;
   blink::ServiceRegistry* serviceRegistry() override;
+  blink::WebPageVisibilityState visibilityState() const override;
 
   // WebFrameSerializerClient implementation:
   void didSerializeDataForFrame(
@@ -669,6 +671,9 @@ class CONTENT_EXPORT RenderFrameImpl
   void PepperFocusChanged(PepperPluginInstanceImpl* instance, bool focused);
 #endif  // ENABLE_PLUGINS
 
+  // Returns the current visibility of the WebView.
+  blink::WebPageVisibilityState GetVisibilityState() const override;

[kenrb, 2016/05/24 20:25:18]

This should be into the RenderFrame implementation block.

[lfg, 2016/05/24 23:33:50]

Done.

+
  protected:
   explicit RenderFrameImpl(const CreateParams& params);