Use optimized scrolling for pepper plugins.

webkit/glue/plugins/pepper_plugin_instance.cc

 // Copyright (c) 2010 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 "webkit/glue/plugins/pepper_plugin_instance.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #if defined(OS_MACOSX)
 #include "base/mac_util.h"
@@ skipping 340 matching lines @@
   } else {
     if (!container_ || position_.IsEmpty())
       return;  // Nothing to do.
     if (rect.IsEmpty())
       container_->invalidate();
     else
       container_->invalidateRect(rect);
   }
 }
 
+void PluginInstance::ScrollRect(int dx, int dy, const gfx::Rect& rect) {
+  if (fullscreen_container_) {
+    fullscreen_container_->ScrollRect(dx, dy, rect);
+  } else {
+    if (full_frame_) {
+      container_->scrollRect(dx, dy, rect);
+    } else {
+      // Can't do optimized scrolling since there could be other elemetns on top

[brettw, 2010/11/03 01:16:41]

elemetns -> elements

+      // of us.
+      InvalidateRect(rect);
+    }
+  }
+}
+
 PP_Var PluginInstance::GetWindowObject() {
   if (!container_)
     return PP_MakeUndefined();
 
   WebFrame* frame = container_->element().document().frame();
   if (!frame)
     return PP_MakeUndefined();
 
   return ObjectVar::NPObjectToPPVar(module(), frame->windowObject());
 }
@@ skipping 713 matching lines @@
   bounds.size.width = dest_rect.width();
   bounds.size.height = dest_rect.height();
 
   CGContextDrawImage(canvas, bounds, image);
   CGContextRestoreGState(canvas);
 }
 #endif  // defined(OS_MACOSX)
 
 
 }  // namespace pepper