New thunk system for Pepper proxy and implementation

ppapi/proxy/ppb_graphics_2d_proxy.h

Index: ppapi/proxy/ppb_graphics_2d_proxy.h
===================================================================
--- ppapi/proxy/ppb_graphics_2d_proxy.h	(revision 84344)
+++ ppapi/proxy/ppb_graphics_2d_proxy.h	(working copy)
@@ -15,7 +15,9 @@
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/proxy/host_resource.h"
 #include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
+#include "ppapi/thunk/ppb_graphics_2d_api.h"
 
 struct PPB_Graphics2D;
 struct PP_Point;
@@ -40,10 +42,6 @@
 
  private:
   // Plugin->renderer message handlers.
-  void OnMsgCreate(PP_Module module,
-                   const PP_Size& size,
-                   PP_Bool is_always_opaque,
-                   HostResource* result);
   void OnMsgPaintImageData(const HostResource& graphics_2d,
                            const HostResource& image_data,
                            const PP_Point& top_left,
@@ -69,6 +67,60 @@
                             ProxyNonThreadSafeRefCount> callback_factory_;
 };
 
+class Graphics2D : public PluginResource,
+                   public ::ppapi::thunk::PPB_Graphics2D_API {
+ public:
+  Graphics2D(const HostResource& host_resource,
+             const PP_Size& size,
+             PP_Bool is_always_opaque)
+      : PluginResource(host_resource),
+        size_(size),
+        is_always_opaque_(is_always_opaque),
+        current_flush_callback_(PP_BlockUntilComplete()) {
+  }
+  virtual ~Graphics2D() {
+  }
+
+  // Resource overrides.
+  virtual Graphics2D* AsGraphics2D() { return this; }
+
+  const PP_Size& size() const { return size_; }
+  PP_Bool is_always_opaque() const { return is_always_opaque_; }
+
+  bool is_flush_pending() const { return !!current_flush_callback_.func; }
+
+  PP_CompletionCallback current_flush_callback() const {
+    return current_flush_callback_;
+  }
+  void set_current_flush_callback(PP_CompletionCallback cb) {
+    current_flush_callback_ = cb;
+  }
+
+  // ResourceObjectBase.
+  virtual PPB_Graphics2D_API* AsGraphics2D_API();
+
+  // PPB_Graphics_2D_API.
+  PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque);
+  void PaintImageData(PP_Resource image_data,
+                      const PP_Point* top_left,
+                      const PP_Rect* src_rect);
+  void Scroll(const PP_Rect* clip_rect,
+              const PP_Point* amount);
+  void ReplaceContents(PP_Resource image_data);
+  int32_t Flush(PP_CompletionCallback callback);
+
+ private:
+  PP_Size size_;
+  PP_Bool is_always_opaque_;
+
+  // In the plugin, this is the current callback set for Flushes. When the
+  // callback function pointer is non-NULL, we're waiting for a flush ACK.
+  PP_CompletionCallback current_flush_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(Graphics2D);
+};
+
+
 }  // namespace proxy
 }  // namespace pp