Migrate Graphics2D to new design.

ppapi/host/ppapi_host.h

Index: ppapi/host/ppapi_host.h
diff --git a/ppapi/host/ppapi_host.h b/ppapi/host/ppapi_host.h
index 748d47a531884c2497b6e985a18a425ff2e9e634..2caf6bca3a2dbe2859e394a4ba89bf87e9ab787a 100644
--- a/ppapi/host/ppapi_host.h
+++ b/ppapi/host/ppapi_host.h
@@ -6,6 +6,7 @@
 #define PPAPI_HOST_PPAPI_HOST_H_
 
 #include <map>
+#include <set>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
@@ -64,9 +65,18 @@ class PPAPI_HOST_EXPORT PpapiHost : public IPC::Sender, public IPC::Listener {
   // ownership of the pointer.
   void AddInstanceMessageFilter(scoped_ptr<InstanceMessageFilter> filter);
 
+  // Returns null if the resource doesn't exist.
+  host::ResourceHost* GetResourceHost(PP_Resource resource) const;
+
+  // Returns true if the resource is a known Graphics2D resource.
+  bool IsGraphics2DResource(PP_Resource resource) const;
+
  private:
   friend class InstanceMessageFilter;
 
+  template <typename Container, typename Element>
+  static void ReleaseResource(Container container, Element element);
+
   // Message handlers.
   void OnHostMsgResourceCall(const proxy::ResourceMessageCallParams& params,
                              const IPC::Message& nested_msg);
@@ -75,9 +85,6 @@ class PPAPI_HOST_EXPORT PpapiHost : public IPC::Sender, public IPC::Listener {
                                 const IPC::Message& nested_msg);
   void OnHostMsgResourceDestroyed(PP_Resource resource);
 
-  // Returns null if the resource doesn't exist.
-  host::ResourceHost* GetResourceHost(PP_Resource resource);
-
   // Non-owning pointer.
   IPC::Sender* sender_;
 
@@ -98,6 +105,10 @@ class PPAPI_HOST_EXPORT PpapiHost : public IPC::Sender, public IPC::Listener {
   typedef std::map<PP_Resource, linked_ptr<ResourceHost> > ResourceMap;
   ResourceMap resources_;
 
+  // This set is used to identify Graphics2D resource.
+  typedef std::set<PP_Resource> Graphics2DSet;
+  Graphics2DSet graphics_2d_set_;
+
   DISALLOW_COPY_AND_ASSIGN(PpapiHost);
 };