gpu: Refactor GpuMemoryBuffer framework for multi-process support.

ppapi/proxy/ppapi_command_buffer_proxy.cc

Index: ppapi/proxy/ppapi_command_buffer_proxy.cc
diff --git a/ppapi/proxy/ppapi_command_buffer_proxy.cc b/ppapi/proxy/ppapi_command_buffer_proxy.cc
index 8ca17e442d1e20b7b6f2d70b25c3e6caaa8269d8..f56ff15d0a9c02bd75e5c3173dd2c1c4a6f84cf5 100644
--- a/ppapi/proxy/ppapi_command_buffer_proxy.cc
+++ b/ppapi/proxy/ppapi_command_buffer_proxy.cc
@@ -230,6 +230,19 @@ uint32 PpapiCommandBufferProxy::InsertSyncPoint() {
   return sync_point;
 }
 
+gfx::GpuMemoryBuffer* PpapiCommandBufferProxy::CreateGpuMemoryBuffer(
+    size_t width,
+    size_t height,
+    unsigned internalformat,
+    int32* id) {
+  NOTREACHED();
+  return NULL;
+}
+
+void PpapiCommandBufferProxy::DestroyGpuMemoryBuffer(int32 id) {
+  NOTREACHED();
+}
+
 bool PpapiCommandBufferProxy::Send(IPC::Message* msg) {
   DCHECK(last_state_.error == gpu::error::kNoError);