Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_view_base.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_base.h"
 
 #include "base/logging.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
@@ skipping 589 matching lines @@
     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
   if (!impl)
     return;
   impl->FlushInput();
 }
 
 SkBitmap::Config RenderWidgetHostViewBase::PreferredReadbackFormat() {
   return SkBitmap::kARGB_8888_Config;
 }
 
+gfx::Size RenderWidgetHostViewBase::GetVisibleViewportSize() const {
+  return GetViewBounds().size();
+}
+
+void RenderWidgetHostViewBase::SetInsets(const gfx::Insets& insets) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace content