gpu: Generate mailboxes on client side

ppapi/proxy/ppapi_command_buffer_proxy.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/ppapi_command_buffer_proxy.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/host_resource.h"
@@ skipping 232 matching lines @@
     unsigned internalformat,
     int32* id) {
   NOTREACHED();
   return NULL;
 }
 
 void PpapiCommandBufferProxy::DestroyGpuMemoryBuffer(int32 id) {
   NOTREACHED();
 }
 
-bool PpapiCommandBufferProxy::GenerateMailboxNames(
-    unsigned num, std::vector<gpu::Mailbox>* names) {
-  // TODO(piman): implement this so we can expose mailboxes to pepper
-  // eventually.
-  NOTREACHED();
-  return false;
-}
-
-
 bool PpapiCommandBufferProxy::Send(IPC::Message* msg) {
   DCHECK(last_state_.error == gpu::error::kNoError);
 
   if (channel_->Send(msg))
     return true;
 
   last_state_.error = gpu::error::kLostContext;
   return false;
 }
 
 void PpapiCommandBufferProxy::UpdateState(
     const gpu::CommandBuffer::State& state,
     bool success) {
   // Handle wraparound. It works as long as we don't have more than 2B state
   // updates in flight across which reordering occurs.
   if (success) {
     if (state.generation - last_state_.generation < 0x80000000U) {
       last_state_ = state;
     }
   } else {
     last_state_.error = gpu::error::kLostContext;
     ++last_state_.generation;
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi