Make cc::SurfaceId unguessable

cc/surfaces/display.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/surfaces/display.h"
 
 #include <stddef.h>
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 93 matching lines @@
 bool Display::Initialize(std::unique_ptr<OutputSurface> output_surface,
                          base::SingleThreadTaskRunner* task_runner) {
   output_surface_ = std::move(output_surface);
   if (!output_surface_->BindToClient(this))
     return false;
   CreateScheduler(task_runner);
   return true;
 }
 
 void Display::SetSurfaceId(SurfaceId id, float device_scale_factor) {
-  DCHECK_EQ(id.id_namespace(), compositor_surface_namespace_);
+  DCHECK_EQ(id.id_namespace, compositor_surface_namespace_);
   if (current_surface_id_ == id && device_scale_factor_ == device_scale_factor)
     return;
 
   TRACE_EVENT0("cc", "Display::SetSurfaceId");
   current_surface_id_ = id;
   device_scale_factor_ = device_scale_factor;
 
   UpdateRootSurfaceResourcesLocked();
   if (scheduler_)
     scheduler_->SetNewRootSurface(id);
@@ skipping 294 matching lines @@
 
   if (surface_id == current_surface_id_)
     UpdateRootSurfaceResourcesLocked();
 }
 
 SurfaceId Display::CurrentSurfaceId() {
   return current_surface_id_;
 }
 
 }  // namespace cc