Plumb an overscroll callback form the compositor to the Android UI thread.

content/renderer/render_view_impl_android.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/render_view_impl.h"
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "cc/switches.h"
 #include "content/common/view_messages.h"
@@ skipping 17 matching lines @@
 void RenderViewImpl::SendUpdateFrameInfo() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       cc::switches::kEnableCompositorFrameMessage))
     return;
 
   update_frame_info_scheduled_ = false;
 
   if (!webview() || !webview()->mainFrame())
     return;
 
-  Send(new ViewHostMsg_UpdateFrameInfo(
-      routing_id_,
-      GetScrollOffset(),
-      webview()->pageScaleFactor(),
-      webview()->minimumPageScaleFactor(),
-      webview()->maximumPageScaleFactor(),
-      gfx::Size(webview()->mainFrame()->contentsSize())));
+  ViewHostMsg_UpdateFrameInfo_Params params;
+  params.scroll_offset = GetScrollOffset();
+  params.unused_scroll_delta = gfx::Vector2d();
+  params.page_scale_factor = webview()->pageScaleFactor();
+  params.min_page_scale_factor = webview()->minimumPageScaleFactor();
+  params.max_page_scale_factor = webview()->maximumPageScaleFactor();
+  params.content_size = gfx::Size(webview()->mainFrame()->contentsSize());
+
+  Send(new ViewHostMsg_UpdateFrameInfo(routing_id_, params));
 }
 
 }  // namespace content