Make echo message per-command-buffer

content/common/gpu/client/command_buffer_proxy.cc

Index: content/common/gpu/client/command_buffer_proxy.cc
diff --git a/content/common/gpu/client/command_buffer_proxy.cc b/content/common/gpu/client/command_buffer_proxy.cc
index f195c8fdbe3dd1e5cf6c7da18d9b5d112698ae97..68016ba4862d421302c9ca39410e20741946bb3d 100644
--- a/content/common/gpu/client/command_buffer_proxy.cc
+++ b/content/common/gpu/client/command_buffer_proxy.cc
@@ -343,7 +343,8 @@ bool CommandBufferProxy::Echo(const base::Closure& callback) {
     return false;
   }
 
-  if (!Send(new GpuChannelMsg_Echo(GpuCommandBufferMsg_EchoAck(route_id_)))) {
+  if (!Send(new GpuCommandBufferMsg_Echo(route_id_,
+                    GpuCommandBufferMsg_EchoAck(route_id_)))) {
     return false;
   }