Implement RenderWidgetHostViewAndroid::GetLastScrollOffset

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/android/build_info.h"
 #include "base/basictypes.h"
@@ skipping 409 matching lines @@
   if (texture_size_in_layer_.IsEmpty())
     return false;
   // This tell us whether a valid frame has arrived or not.
   if (!frame_evictor_->HasFrame())
     return false;
 
   return true;
 }
 
 gfx::Vector2dF RenderWidgetHostViewAndroid::GetLastScrollOffset() const {
-  NOTREACHED();
-  return gfx::Vector2dF();
+  return last_scroll_offset_;
 }
 
 gfx::NativeView RenderWidgetHostViewAndroid::GetNativeView() const {
   return content_view_core_->GetViewAndroid();
 }
 
 gfx::NativeViewId RenderWidgetHostViewAndroid::GetNativeViewId() const {
   return reinterpret_cast<gfx::NativeViewId>(
       const_cast<RenderWidgetHostViewAndroid*>(this));
 }
@@ skipping 585 matching lines @@
 
   if (overscroll_effect_) {
     overscroll_effect_->UpdateDisplayParameters(
         CreateOverscrollDisplayParameters(frame_metadata));
   }
 }
 
 void RenderWidgetHostViewAndroid::InternalSwapCompositorFrame(
     uint32 output_surface_id,
     scoped_ptr<cc::CompositorFrame> frame) {
+  last_scroll_offset_ = frame->metadata.root_scroll_offset;
   if (!frame->delegated_frame_data) {
     LOG(ERROR) << "Non-delegated renderer path no longer supported";
     return;
   }
 
   if (locks_on_frame_count_ > 0) {
     DCHECK(HasValidFrame());
     RetainFrame(output_surface_id, frame.Pass());
     return;
   }
@@ skipping 809 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content