gpu: Add GpuFence framework.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 78db5e2017cdbf8747b73a848798e8fdcbcf9c7c..f7809743bf08fb7f8f2be158ff772fcbbb2e6b48 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -193,6 +193,8 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER_DELAY_REPLY(
         ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer,
         OnAllocateGpuMemoryBuffer)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(ChildProcessHostMsg_SyncCreateGpuFence,
+                                    OnCreateGpuFence)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ChildProcessHostMsg_EstablishGpuChannel,
                                     OnEstablishGpuChannel)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ChildProcessHostMsg_HasGpuProcess,
@@ -691,4 +693,19 @@ void RenderMessageFilter::OnDeletedGpuMemoryBuffer(
       id, PeerHandle(), render_process_id_, sync_token);
 }
 
+void RenderMessageFilter::OnCreateGpuFence(IPC::Message* reply) {
+  DCHECK(BrowserGpuMemoryBufferManager::current());
+
+  BrowserGpuMemoryBufferManager::current()->CreateGpuFenceForChildProcess(
+      PeerHandle(),
+      base::Bind(&RenderMessageFilter::GpuFenceCreated, this, reply));
+}
+
+void RenderMessageFilter::GpuFenceCreated(IPC::Message* reply,
+                                          const gfx::GpuFenceHandle& handle) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  ChildProcessHostMsg_SyncCreateGpuFence::WriteReplyParams(reply, handle);
+  Send(reply);
+}
+
 }  // namespace content