SurfaceAggregator should check whether output is secure when drawin

cc/trees/proxy_main.cc

 // Copyright 2015 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/trees/proxy_main.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/trace_event/trace_event.h"
@@ skipping 420 matching lines @@
   completion.Wait();
 }
 
 void ProxyMain::UpdateTopControlsState(TopControlsState constraints,
                                        TopControlsState current,
                                        bool animate) {
   DCHECK(IsMainThread());
   channel_main_->UpdateTopControlsStateOnImpl(constraints, current, animate);
 }
 
-void ProxyMain::SetOutputIsSecure(bool output_is_secure) {
-  NOTREACHED() << "Only used by SingleProxyMain";
-}
-
 bool ProxyMain::SendCommitRequestToImplThreadIfNeeded(
     CommitPipelineStage required_stage) {
   DCHECK(IsMainThread());
   DCHECK_NE(NO_PIPELINE_STAGE, required_stage);
   bool already_posted = max_requested_pipeline_stage_ != NO_PIPELINE_STAGE;
   max_requested_pipeline_stage_ =
       std::max(max_requested_pipeline_stage_, required_stage);
   if (already_posted)
     return false;
   channel_main_->SetNeedsCommitOnImpl();
   return true;
 }
 
 bool ProxyMain::IsMainThread() const {
   return task_runner_provider_->IsMainThread();
 }
 
 }  // namespace cc