Command to mark surface inactive, so gpu process can release resources.

content/renderer/gpu/command_buffer_proxy.cc

Index: content/renderer/gpu/command_buffer_proxy.cc
diff --git a/content/renderer/gpu/command_buffer_proxy.cc b/content/renderer/gpu/command_buffer_proxy.cc
index 4cc5cde3f12bbf649d6631fbbba5c2d40546e42f..4e68cb1eafe3bba15748102b6b0b9c15b8336e57 100644
--- a/content/renderer/gpu/command_buffer_proxy.cc
+++ b/content/renderer/gpu/command_buffer_proxy.cc
@@ -367,6 +367,15 @@ bool CommandBufferProxy::Echo(const base::Closure& callback) {
   return true;
 }
 
+bool CommandBufferProxy::SetSurfaceVisible(bool visible) {
+  if (last_state_.error != gpu::error::kNoError) {
+    return false;
+  }
+
+  return Send(new GpuCommandBufferMsg_SetSurfaceVisible(route_id_, visible));
+}
+
+
 bool CommandBufferProxy::SetParent(CommandBufferProxy* parent_command_buffer,
                                    uint32 parent_texture_id) {
   if (last_state_.error != gpu::error::kNoError)