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 335 matching lines @@
 
 IPC_MESSAGE_ROUTED4(FrameHostMsg_DidFailLoadWithError,
                     GURL /* validated_url */,
                     bool /* is_main_frame */,
                     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_ROUTED2(FrameHostMsg_DidFinishLoad,
@@ skipping 82 matching lines @@
 // content area, and a context menu should be shown for it. The params
 // object contains information about the node(s) that were selected when the
 // user right clicked.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ContextMenu, content::ContextMenuParams)
 
 // Initial drawing parameters for a child frame that has been swapped out to
 // another process.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_InitializeChildFrame,
                     gfx::Rect /* frame_rect */,
                     float /* scale_factor */)