Added a unique command buffer ID for command buffers.

ppapi/proxy/resource_creation_proxy.h

Index: ppapi/proxy/resource_creation_proxy.h
diff --git a/ppapi/proxy/resource_creation_proxy.h b/ppapi/proxy/resource_creation_proxy.h
index 4aa3d43b81dc4a7490407b0357fd470f129d4c30..6f2169388047ef2e64d303877584984898e6a5e2 100644
--- a/ppapi/proxy/resource_creation_proxy.h
+++ b/ppapi/proxy/resource_creation_proxy.h
@@ -20,6 +20,7 @@ struct PP_Size;
 namespace ppapi {
 
 class HostResource;
+struct CommandBufferIDPair;
 
 namespace proxy {
 
@@ -121,7 +122,8 @@ class ResourceCreationProxy : public InterfaceProxy,
       PP_Resource share_context,
       const int32_t* attrib_list,
       gpu::Capabilities* capabilities,
-      base::SharedMemoryHandle* shared_state) override;
+      base::SharedMemoryHandle* shared_state,
+      ppapi::CommandBufferIDPair* id_pair) override;
   PP_Resource CreateHostResolver(PP_Instance instance) override;
   PP_Resource CreateHostResolverPrivate(PP_Instance instance) override;
   PP_Resource CreateImageData(PP_Instance instance,