Fix pushState causing stop/reload button and favicon to flicker.

content/common/frame_messages.h

 // Copyright 2013 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/frame_message_enums.h"
@@ skipping 354 matching lines @@
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidFinishDocumentLoad)
 
 IPC_MESSAGE_ROUTED3(FrameHostMsg_DidFailLoadWithError,
                     GURL /* validated_url */,
                     int /* error_code */,
                     base::string16 /* error_description */)
 
 // Sent when the renderer starts loading the page. This corresponds to
 // Blink's notion of the throbber starting. Note that sometimes you may get
 // duplicates of these during a single load.
-IPC_MESSAGE_ROUTED0(FrameHostMsg_DidStartLoading)
+// |to_different_document| will be true unless the load is a fragment
+// navigation, or triggered by history.pushState/replaceState.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_DidStartLoading,
+                    bool /* to_different_document */)
 
 // Sent when the renderer is done loading a page. This corresponds to Blink's
 // notion of the throbber stopping.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidStopLoading)
 
 // Requests that the given URL be opened in the specified manner.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_OpenURL, FrameHostMsg_OpenURL_Params)
 
 // Notifies the browser that a frame finished loading.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_DidFinishLoad,
@@ skipping 98 matching lines @@
                     float /* scale_factor */)
 
 // Response for FrameMsg_JavaScriptExecuteRequest, sent when a reply was
 // requested. The ID is the parameter supplied to
 // FrameMsg_JavaScriptExecuteRequest. The result has the value returned by the
 // script as its only element, one of Null, Boolean, Integer, Real, Date, or
 // String.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_JavaScriptExecuteResponse,
                     int  /* id */,
                     base::ListValue  /* result */)