Implement PPAPI VideoDecode out-of-process support

ppapi/proxy/ppb_buffer_proxy.h

Index: ppapi/proxy/ppb_buffer_proxy.h
diff --git a/ppapi/proxy/ppb_buffer_proxy.h b/ppapi/proxy/ppb_buffer_proxy.h
index 60029509a2180d01dbae25e46c4f51803bcf78aa..e11b94f656af475a19965c25dd8072b532f28f47 100644
--- a/ppapi/proxy/ppb_buffer_proxy.h
+++ b/ppapi/proxy/ppb_buffer_proxy.h
@@ -8,6 +8,8 @@
 #include "base/shared_memory.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/thunk/ppb_buffer_api.h"
 
 struct PPB_Buffer_Dev;
 
@@ -16,6 +18,35 @@ namespace proxy {
 
 class HostResource;
 
+class Buffer : public ppapi::thunk::PPB_Buffer_API,
+               public PluginResource {
+ public:
+  Buffer(const HostResource& resource,
+         const base::SharedMemoryHandle& shm_handle,
+         uint32_t size);
+  virtual ~Buffer();
+
+  // Resource overrides.
+  virtual Buffer* AsBuffer() OVERRIDE;
+
+  // ResourceObjectBase overrides.
+  virtual ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE;
+
+  // PPB_Buffer_API implementation.
+  virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE;
+  virtual PP_Bool IsMapped() OVERRIDE;
+  virtual void* Map() OVERRIDE;
+  virtual void Unmap() OVERRIDE;
+
+ private:
+  base::SharedMemory shm_;
+  uint32_t size_;
+  void* mapped_data_;
+  int map_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(Buffer);
+};
+
 class PPB_Buffer_Proxy : public InterfaceProxy {
  public:
   PPB_Buffer_Proxy(Dispatcher* dispatcher, const void* target_interface);