Cache cc::SharedBitmaps used by PepperGraphics2DHost to upload

content/renderer/pepper/pepper_plugin_instance_impl.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1683 matching lines @@
 
   sent_initial_did_change_view_ = true;
   last_sent_view_data_ = view_data_;
   ScopedPPResource resource(
       ScopedPPResource::PassRef(),
       (new PPB_View_Shared(ppapi::OBJECT_IS_IMPL, pp_instance(), view_data_))
           ->GetReference());
 
   UpdateLayerTransform();
 
+  if (bound_graphics_2d_platform_ &&
+      (!view_data_.is_page_visible ||
+       PP_ToGfxRect(view_data_.clip_rect).IsEmpty())) {
+    bound_graphics_2d_platform_->ClearCache();
+  }
+
   // It's possible that Delete() has been called but the renderer hasn't
   // released its reference to this object yet.
   if (instance_interface_) {
     instance_interface_->DidChangeView(
         pp_instance(), resource, &view_data_.rect, &view_data_.clip_rect);
   }
 }
 
 void PepperPluginInstanceImpl::ReportGeometry() {
   // If this call was delayed, we may have transitioned back to fullscreen in
@@ skipping 1663 matching lines @@
     // Running out-of-process. Initiate an IPC call to notify the plugin
     // process.
     ppapi::proxy::HostDispatcher* dispatcher =
         ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
     dispatcher->Send(new PpapiMsg_PPPInstance_HandleDocumentLoad(
         ppapi::API_ID_PPP_INSTANCE, pp_instance(), pending_host_id, data));
   }
 }
 
 }  // namespace content