Move LoadProgressTracker to the browser process.

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 391 matching lines @@
                     FrameHostMsg_DidCommitProvisionalLoad_Params)
 
 // Notifies the browser that a document has been loaded.
 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.
-// |to_different_document| will be true unless the load is a fragment
-// navigation, or triggered by history.pushState/replaceState.
+// Sent when the renderer starts loading the page. |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.
+// Sent when the renderer is done loading a page.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidStopLoading)
 
+// Sent when the renderer changed the progress of a load.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_DidChangeLoadProgress,
+                    double /* load_progress */)
+
 // 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,
                     GURL /* validated_url */)
 
 // Sent when after the onload handler has been invoked for the document
 // in this frame. Sent for top-level frames.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_DocumentOnLoadCompleted,
@@ skipping 149 matching lines @@
                     SkColor /* color */)
 
 // Notifies the browser that media has started/stopped playing.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_MediaPlayingNotification,
                     int64 /* player_cookie, distinguishes instances */,
                     bool /* has_video */,
                     bool /* has_audio */)
 
 IPC_MESSAGE_ROUTED1(FrameHostMsg_MediaPausedNotification,
                     int64 /* player_cookie, distinguishes instances */)