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

content/browser/renderer_host/render_widget_host_view_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/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 579 matching lines @@
 
 void RenderWidgetHostViewAndroid::SetCachedPageScaleFactorLimits(
     float minimum_scale,
     float maximum_scale) {
   if (content_view_core_)
     content_view_core_->UpdatePageScaleLimits(minimum_scale, maximum_scale);
 }
 
 void RenderWidgetHostViewAndroid::UpdateFrameInfo(
     const gfx::Vector2d& scroll_offset,
+    const gfx::Vector2d& unused_scroll_delta,
     float page_scale_factor,
     float min_page_scale_factor,
     float max_page_scale_factor,
     const gfx::Size& content_size,
     const gfx::Vector2dF& controls_offset,
     const gfx::Vector2dF& content_offset) {
   if (content_view_core_) {
     content_view_core_->UpdateContentSize(content_size.width(),
                                           content_size.height());
     content_view_core_->UpdatePageScaleLimits(min_page_scale_factor,
                                               max_page_scale_factor);
     content_view_core_->UpdateScrollOffsetAndPageScaleFactor(scroll_offset.x(),
                                                              scroll_offset.y(),
                                                              page_scale_factor);
     content_view_core_->UpdateOffsetsForFullscreen(controls_offset.y(),
                                                    content_offset.y());
+    content_view_core_->UpdateUnusedScrollOffset(unused_scroll_delta.x(),
+                                                 unused_scroll_delta.y());
   }
 }
 
 void RenderWidgetHostViewAndroid::SetContentViewCore(
     ContentViewCoreImpl* content_view_core) {
   if (content_view_core_ && is_layer_attached_)
     content_view_core_->RemoveLayer(layer_);
 
   content_view_core_ = content_view_core;
   if (content_view_core_ && is_layer_attached_)
@@ skipping 25 matching lines @@
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content