Implement overscroll support for the virtual keyboard.

content/renderer/render_widget.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 302 matching lines @@
 
   // Set the background of the render widget to a bitmap. The bitmap will be
   // tiled in both directions if it isn't big enough to fill the area. This is
   // mainly intended to be used in conjuction with WebView::SetIsTransparent().
   virtual void SetBackground(const SkBitmap& bitmap);
 
   // Resizes the render widget.
   void Resize(const gfx::Size& new_size,
               const gfx::Size& physical_backing_size,
               float overdraw_bottom_height,
+              const gfx::Size& visible_viewport_size,
               const gfx::Rect& resizer_rect,
               bool is_fullscreen,
               ResizeAck resize_ack);
   // Used to force the size of a window when running layout tests.
   void ResizeSynchronously(const gfx::Rect& new_position);
   virtual void SetScreenMetricsEmulationParameters(
       float device_scale_factor,
       const gfx::Point& root_layer_offset,
       float root_layer_scale);
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
@@ skipping 211 matching lines @@
 
   bool has_frame_pending_;
 
   // The size of the view's backing surface in non-DPI-adjusted pixels.
   gfx::Size physical_backing_size_;
 
   // The height of the physical backing surface that is overdrawn opaquely in
   // the browser, for example by an on-screen-keyboard (in DPI-adjusted pixels).
   float overdraw_bottom_height_;
 
+  // The size of the visible viewport in DPI-adjusted pixels.
+  gfx::Size visible_viewport_size_;
+
   // The area that must be reserved for drawing the resize corner.
   gfx::Rect resizer_rect_;
 
   // Flags for the next ViewHostMsg_UpdateRect message.
   int next_paint_flags_;
 
   // Whether the WebWidget is in auto resize mode, which is used for example
   // by extension popups.
   bool auto_resize_mode_;
 
@@ skipping 159 matching lines @@
 
   ui::MenuSourceType context_menu_source_type_;
   gfx::Point touch_editing_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_