Implements frame sniffer to watch iframe loading state.

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 2277c8f6f7a7d9fe7e87c88f2c57376aed3f6ed2..5b688235d0e163693d8f631309d5a0672abf6091 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -15,10 +15,11 @@
 #include "chrome/common/thumbnail_score.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/renderer/about_handler.h"
-#include "chrome/renderer/content_settings_observer.h"
 #include "chrome/renderer/automation/dom_automation_controller.h"
+#include "chrome/renderer/content_settings_observer.h"
 #include "chrome/renderer/extensions/extension_dispatcher.h"
 #include "chrome/renderer/external_host_bindings.h"
+#include "chrome/renderer/frame_sniffer.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
 #include "chrome/renderer/translate_helper.h"
@@ -231,6 +232,7 @@ bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
                         OnSetAllowRunningInsecureContent)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetClientSidePhishingDetection,
                         OnSetClientSidePhishingDetection)
+    IPC_MESSAGE_HANDLER(ViewMsg_StartFrameSniffer, OnStartFrameSniffer)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -334,6 +336,10 @@ void ChromeRenderViewObserver::OnSetClientSidePhishingDetection(
 #endif
 }
 
+void ChromeRenderViewObserver::OnStartFrameSniffer(const string16& frame_name) {
+  new FrameSniffer(render_view(), frame_name);
+}
+
 bool ChromeRenderViewObserver::allowDatabase(
     WebFrame* frame,
     const WebString& name,