gpu: Add GpuFence framework.

gpu/ipc/common/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 <stdint.h>
 
 #include <string>
@@ skipping 54 matching lines @@
 
 IPC_STRUCT_BEGIN(GpuCommandBufferMsg_CreateImage_Params)
   IPC_STRUCT_MEMBER(int32_t, id)
   IPC_STRUCT_MEMBER(gfx::GpuMemoryBufferHandle, gpu_memory_buffer)
   IPC_STRUCT_MEMBER(gfx::Size, size)
   IPC_STRUCT_MEMBER(gfx::BufferFormat, format)
   IPC_STRUCT_MEMBER(uint32_t, internal_format)
   IPC_STRUCT_MEMBER(uint64_t, image_release_count)
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(GpuCommandBufferMsg_CreateFence_Params)
+  IPC_STRUCT_MEMBER(int32_t, id)
+  IPC_STRUCT_MEMBER(gfx::GpuFenceHandle, gpu_fence)
+IPC_STRUCT_END()
+
 IPC_STRUCT_BEGIN(GpuCommandBufferMsg_SwapBuffersCompleted_Params)
 #if defined(OS_MACOSX)
   // Mac-specific parameters used to present CALayers hosted in the GPU process.
   // TODO(ccameron): Remove these parameters once the CALayer tree is hosted in
   // the browser process.
   // https://crbug.com/604052
   // Only one of ca_context_id or io_surface may be non-0.
   IPC_STRUCT_MEMBER(CAContextID, ca_context_id)
   IPC_STRUCT_MEMBER(bool, fullscreen_low_power_ca_context_valid)
   IPC_STRUCT_MEMBER(CAContextID, fullscreen_low_power_ca_context_id)
@@ skipping 160 matching lines @@
                     GpuCommandBufferMsg_CreateImage_Params /* params */)
 
 // Destroy a previously created image.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_DestroyImage, int32_t /* id */)
 
 // Attaches an external image stream to the client texture.
 IPC_SYNC_MESSAGE_ROUTED2_1(GpuCommandBufferMsg_CreateStreamTexture,
                            uint32_t, /* client_texture_id */
                            int32_t,  /* stream_id */
                            bool /* succeeded */)
+
+// Create a fence from an existing gpu fence. The id that can be
+// used to identify the fence from a command buffer.
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_CreateFence,
+                    GpuCommandBufferMsg_CreateFence_Params /* params */)
+
+// Destroy a previously created fence.
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_DestroyFence, int32_t /* id */)