gpu: Add GpuFence framework.

gpu/ipc/common/gpu_messages.h

Index: gpu/ipc/common/gpu_messages.h
diff --git a/gpu/ipc/common/gpu_messages.h b/gpu/ipc/common/gpu_messages.h
index b1d6fdc42cbad14b8c8d5df5cd17eb24097b79d6..a1230e60763aed211992880e2700f9dd993e3f6d 100644
--- a/gpu/ipc/common/gpu_messages.h
+++ b/gpu/ipc/common/gpu_messages.h
@@ -72,6 +72,11 @@ IPC_STRUCT_BEGIN(GpuCommandBufferMsg_CreateImage_Params)
   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.
@@ -252,3 +257,11 @@ 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 */)