Implements frame sniffer to watch iframe loading state.

chrome/common/render_messages.h

 // Copyright (c) 2011 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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 271 matching lines @@
                     bool /* allowed */)
 
 // Sent in response to ViewHostMsg_DidBlockRunningInsecureContent.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetAllowRunningInsecureContent,
                     bool /* allowed */)
 
 // Sent when the profile changes the kSafeBrowsingEnabled preference.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetClientSidePhishingDetection,
                     bool /* enable_phishing_detection */)
 
+// This message asks frame sniffer start.
+IPC_MESSAGE_ROUTED1(ChromeViewMsg_StartFrameSniffer,
+                    string16 /* frame-name */)
+
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters
 // while performing stress testing.
 IPC_MESSAGE_ROUTED2(ChromeViewMsg_JavaScriptStressTestControl,
                     int /* cmd */,
                     int /* param */)
 
 //-----------------------------------------------------------------------------
 // TabContents messages
@@ skipping 223 matching lines @@
                     std::vector<std::string> /* suggestions */,
                     InstantCompleteBehavior)
 
 IPC_MESSAGE_ROUTED2(ChromeViewHostMsg_InstantSupportDetermined,
                     int32 /* page_id */,
                     bool  /* result */)
 
 // The currently displayed PDF has an unsupported feature.
 IPC_MESSAGE_ROUTED0(ChromeViewHostMsg_PDFHasUnsupportedFeature)
 
+// This message indicates the error appeared in the frame.
+IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_FrameLoadingError,
+                    int /* error */)
+
 // The following messages are used to set and get cookies for ChromeFrame
 // processes.
 // Used to set a cookie. The cookie is set asynchronously, but will be
 // available to a subsequent ChromeViewHostMsg_GetCookies request.
 IPC_MESSAGE_ROUTED3(ChromeViewHostMsg_SetCookie,
                     GURL /* url */,
                     GURL /* first_party_for_cookies */,
                     std::string /* cookie */)
 
 // Used to get cookies for the given URL. This may block waiting for a
 // previous SetCookie message to be processed.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetCookies,
                            GURL /* url */,
                            GURL /* first_party_for_cookies */,
                            std::string /* cookies */)
-