gpu: Generate mailboxes on client side

content/common/gpu/gpu_messages.h

 // 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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include <string>
 #include <vector>
 
@@ skipping 439 matching lines @@
                             gfx::Size, /* size */
                             GPUCreateCommandBufferConfig, /* init_params */
                             int32 /* route_id */)
 
 // The CommandBufferProxy sends this to the GpuCommandBufferStub in its
 // destructor, so that the stub deletes the actual CommandBufferService
 // object that it's hosting.
 IPC_SYNC_MESSAGE_CONTROL1_0(GpuChannelMsg_DestroyCommandBuffer,
                             int32 /* instance_id */)
 
-// Generates n new unique mailbox names synchronously.
-IPC_SYNC_MESSAGE_CONTROL1_1(GpuChannelMsg_GenerateMailboxNames,
-                            unsigned, /* num */
-                            std::vector<gpu::Mailbox> /* mailbox_names */)
-
-// Generates n new unique mailbox names asynchronously.
-IPC_MESSAGE_CONTROL1(GpuChannelMsg_GenerateMailboxNamesAsync,
-                     unsigned /* num */)
-
-// Reply to GpuChannelMsg_GenerateMailboxNamesAsync.
-IPC_MESSAGE_CONTROL1(GpuChannelMsg_GenerateMailboxNamesReply,
-                     std::vector<gpu::Mailbox> /* mailbox_names */)
-
 // Create a new GPU-accelerated video encoder.
 IPC_SYNC_MESSAGE_CONTROL0_1(GpuChannelMsg_CreateVideoEncoder,
                             int32 /* route_id */)
 
 IPC_MESSAGE_CONTROL1(GpuChannelMsg_DestroyVideoEncoder, int32 /* route_id */)
 
 // Sent by DevTools agent in the inspected renderer process to initiate GPU
 // instrumentation events recording.
 IPC_SYNC_MESSAGE_CONTROL0_1(GpuChannelMsg_DevToolsStartEventsRecording,
                             int32 /* route_id */)
@@ skipping 301 matching lines @@
 
 // Notify the renderer that an output buffer has been filled with encoded data.
 IPC_MESSAGE_ROUTED3(AcceleratedVideoEncoderHostMsg_BitstreamBufferReady,
                     int32 /* bitstream_buffer_id */,
                     uint32 /* payload_size */,
                     bool /* key_frame */)
 
 // Report error condition.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyError,
                     media::VideoEncodeAccelerator::Error /* error */)