content/gpu: Simplify gpu channel message handling.

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 533 matching lines @@
 
 // Asynchronously synchronize the put and get offsets of both processes.
 // Caller passes its current put offset. Current state (including get offset)
 // is returned in shared memory. The input latency info for the current
 // frame is also sent to the GPU process.
 IPC_MESSAGE_ROUTED3(GpuCommandBufferMsg_AsyncFlush,
                     int32 /* put_offset */,
                     uint32 /* flush_count */,
                     std::vector<ui::LatencyInfo> /* latency_info */)
 
-// Asynchronously process any commands known to the GPU process. This is only
-// used in the event that a channel is unscheduled and needs to be flushed
-// again to process any commands issued subsequent to unscheduling. The GPU
-// process actually sends it (deferred) to itself.
-IPC_MESSAGE_ROUTED0(GpuCommandBufferMsg_Rescheduled)
-
 // Sent by the GPU process to display messages in the console.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_ConsoleMsg,
                     GPUCommandBufferConsoleMessage /* msg */)
 
 // Register an existing shared memory transfer buffer. The id that can be
 // used to identify the transfer buffer from a command buffer.
 IPC_MESSAGE_ROUTED3(GpuCommandBufferMsg_RegisterTransferBuffer,
                     int32 /* id */,
                     base::SharedMemoryHandle /* transfer_buffer */,
                     uint32 /* size */)
@@ skipping 50 matching lines @@
     bool /* has_callback */)
 
 // Inserts a sync point into the channel. This is handled on the IO thread, so
 // can be expected to be reasonably fast, but the sync point is actually
 // retired in order with respect to the other calls. The sync point is shared
 // across channels.
 IPC_SYNC_MESSAGE_ROUTED1_1(GpuCommandBufferMsg_InsertSyncPoint,
                            bool /* retire */,
                            uint32 /* sync_point */)
 
-// Retires the sync point. Note: this message is not sent explicitly by the
-// renderer, but is synthesized by the GPU process.
+// Retires the sync point.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_RetireSyncPoint,
                     uint32 /* sync_point */)
 
 // Makes this command buffer signal when a sync point is reached, by sending
 // back a GpuCommandBufferMsg_SignalSyncPointAck message with the same
 // signal_id.
 IPC_MESSAGE_ROUTED2(GpuCommandBufferMsg_SignalSyncPoint,
                     uint32 /* sync_point */,
                     uint32 /* signal_id */)
 
@@ skipping 164 matching lines @@
 IPC_MESSAGE_ROUTED0(AcceleratedJpegDecoderMsg_Destroy)
 
 //------------------------------------------------------------------------------
 // Accelerated JPEG Decoder Host Messages
 // These messages are sent from the GPU process to Browser process.
 //
 // Report decode status.
 IPC_MESSAGE_ROUTED2(AcceleratedJpegDecoderHostMsg_DecodeAck,
                     int32, /* bitstream_buffer_id */
                     media::JpegDecodeAccelerator::Error /* error */)