[Mac] Rubber-banding on Lion.

content/renderer/render_widget.cc

 // Copyright (c) 2011 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/renderer/render_widget.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 813 matching lines @@
     params.copy_rects.clear();
   } else {
     params.scroll_rect = update.scroll_rect;
     params.copy_rects.swap(copy_rects);  // TODO(darin): clip to bounds?
   }
   params.view_size = size_;
   params.resizer_rect = resizer_rect_;
   params.plugin_window_moves.swap(plugin_window_moves_);
   params.flags = next_paint_flags_;
   params.scroll_offset = GetScrollOffset();
+  params.contents_size = GetContentsSize();
 
   update_reply_pending_ = true;
   Send(new ViewHostMsg_UpdateRect(routing_id_, params));
   next_paint_flags_ = 0;
 
   UpdateInputMethod();
 
   // Let derived classes know we've painted.
   DidInitiatePaint();
 }
@@ skipping 397 matching lines @@
     gfx::Rect* clip) {
   // Bare RenderWidgets don't support optimized plugin painting.
   return NULL;
 }
 
 gfx::Point RenderWidget::GetScrollOffset() {
   // Bare RenderWidgets don't support scroll offset.
   return gfx::Point(0, 0);
 }
 
+gfx::Size RenderWidget::GetContentsSize() {
+  // Bare RenderWidgets don't support contents size.
+  return gfx::Size(0, 0);
+}
+
 void RenderWidget::SetHidden(bool hidden) {
   if (is_hidden_ == hidden)
     return;
 
   // The status has changed.  Tell the RenderThread about it.
   is_hidden_ = hidden;
   if (is_hidden_)
     render_thread_->WidgetHidden();
   else
     render_thread_->WidgetRestored();
@@ skipping 130 matching lines @@
 
 void RenderWidget::CleanupWindowInPluginMoves(gfx::PluginWindowHandle window) {
   for (WebPluginGeometryVector::iterator i = plugin_window_moves_.begin();
        i != plugin_window_moves_.end(); ++i) {
     if (i->window == window) {
       plugin_window_moves_.erase(i);
       break;
     }
   }
 }