Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 1c8254da11bd52f6ae9665d3b9216f8397c62a59..14d844450e63ffd02df950e651c076cabc0d4aa2 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -768,6 +768,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
   // the browser, for example by an on-screen-keyboard (in DPI-adjusted pixels).
   float overdraw_bottom_height_;
 
+  // The height of the visible viewport, which may be less than the view height
+  // if the view is partially occluded (e.g. by a virtual keyboard).  The height
+  // is in DPI-adjusted pixels.
+  int visible_viewport_height_;
+
   // The size we last sent as requested size to the renderer. |current_size_|
   // is only updated once the resize message has been ack'd. This on the other
   // hand is updated when the resize message is sent. This is very similar to