Make cc::SurfaceId unguessable

cc/surfaces/surface.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/surface.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 80 matching lines @@
   bool referenced_surfaces_changed =
       (referenced_surfaces_ != new_referenced_surfaces);
   referenced_surfaces_ = new_referenced_surfaces;
   std::vector<uint32_t> satisfies_sequences;
   if (current_frame_)
     current_frame_->metadata.satisfies_sequences.swap(satisfies_sequences);
   if (referenced_surfaces_changed || !satisfies_sequences.empty()) {
     // Notify the manager that sequences were satisfied either if some new
     // sequences were satisfied, or if the set of referenced surfaces changed
     // to force a GC to happen.
-    factory_->manager()->DidSatisfySequences(
-        SurfaceIdAllocator::NamespaceForId(surface_id_), &satisfies_sequences);
+    factory_->manager()->DidSatisfySequences(surface_id_.id_namespace(),
+                                             &satisfies_sequences);
   }
 }
 
 void Surface::RequestCopyOfOutput(
     std::unique_ptr<CopyOutputRequest> copy_request) {
   if (current_frame_ &&
       !current_frame_->delegated_frame_data->render_pass_list.empty()) {
     std::vector<std::unique_ptr<CopyOutputRequest>>& copy_requests =
         current_frame_->delegated_frame_data->render_pass_list.back()
             ->copy_requests;
@@ skipping 85 matching lines @@
   if (current_frame_) {
     for (const auto& render_pass :
          current_frame_->delegated_frame_data->render_pass_list) {
       for (const auto& copy_request : render_pass->copy_requests)
         copy_request->SendEmptyResult();
     }
   }
 }
 
 }  // namespace cc