Don't copy the Graphics2D when binding a new one. This brings the

ppapi/examples/2d/paint_manager_example.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 "ppapi/c/pp_input_event.h"
 #include "ppapi/cpp/graphics_2d.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/paint_manager.h"
@@ skipping 55 matching lines @@
       default:
         return false;
     }
   }
 
   virtual void DidChangeView(const pp::Rect& position, const pp::Rect& clip) {
     paint_manager_.SetSize(position.size());
   }
 
   // PaintManager::Client implementation.
-  virtual bool OnPaint(pp::Graphics2D&,
+  virtual bool OnPaint(pp::Graphics2D graphics_2d&,
                        const std::vector<pp::Rect>& paint_rects,
                        const pp::Rect& paint_bounds) {
     // Make an image just large enough to hold all dirty rects. We won't
     // actually paint all of these pixels below, but rather just the dirty
     // ones. Since image allocation can be somewhat heavyweight, we wouldn't
     // want to allocate separate images in the case of multiple dirty rects.
     pp::ImageData updated_image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
                                 paint_bounds.size(), false);
 
     // We could repaint everything inside the image we made above. For this
@@ skipping 20 matching lines @@
     // Paint the square black. Because we're lazy, we do this outside of the
     // loop above.
     pp::Rect square = SquareForPoint(last_x_, last_y_);
     FillRect(&updated_image,
              square.x() - paint_bounds.x(),
              square.y() - paint_bounds.y(),
              square.width(),
              square.height(),
              0xFF000000);
 
+    graphics_2d.PaintImageData(updated_image, paint_bounds.point());
     return true;
   }
 
  private:
   void UpdateSquare(int x, int y) {
     if (x == last_x_ && y == last_y_)
       return;  // Nothing changed.
 
     // Invalidate the region around the old square which needs to be repainted
     // because it's no longer there.
@@ skipping 21 matching lines @@
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp