Remove GpuHostMsg_FrameDrawn and replace with client channel swap ack

content/common/gpu/client/command_buffer_proxy_impl.cc

Index: content/common/gpu/client/command_buffer_proxy_impl.cc
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.cc b/content/common/gpu/client/command_buffer_proxy_impl.cc
index a0f67b3dedb55955c6cbb71f0bea71a06cc660b0..f25120c80d99422bbeb01073ae72e21efa3f7e02 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -47,6 +47,8 @@ bool CommandBufferProxyImpl::OnMessageReceived(const IPC::Message& message) {
                         OnSetMemoryAllocation);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalSyncPointAck,
                         OnSignalSyncPointAck);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SwapBuffersCompleted,
+                        OnSwapBuffersCompleted);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -192,6 +194,11 @@ void CommandBufferProxyImpl::SetLatencyInfo(
     latency_info_.push_back(latency_info[i]);
 }
 
+void CommandBufferProxyImpl::SetSwapBuffersCompletionCallback(
+    const SwapBuffersCompletionCallback& callback) {
+  swap_buffers_completion_callback_ = callback;
+}
+
 void CommandBufferProxyImpl::WaitForTokenInRange(int32 start, int32 end) {
   TRACE_EVENT2("gpu",
                "CommandBufferProxyImpl::WaitForToken",
@@ -504,4 +511,16 @@ gpu::CommandBufferSharedState* CommandBufferProxyImpl::shared_state() const {
       shared_state_shm_->memory());
 }
 
+void CommandBufferProxyImpl::OnSwapBuffersCompleted(
+    const std::vector<ui::LatencyInfo>& latency_info) {
+  if (!swap_buffers_completion_callback_.is_null()) {
+    if (!ui::LatencyInfo::Verify(
+            latency_info, "CommandBufferProxyImpl::OnSwapBuffersCompleted")) {
+      swap_buffers_completion_callback_.Run(std::vector<ui::LatencyInfo>());
+      return;
+    }
+    swap_buffers_completion_callback_.Run(latency_info);
+  }
+}
+
 }  // namespace content