SurfaceAggregator should check whether output is secure when drawin

cc/trees/proxy.h

 // Copyright 2011 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.
 
 #ifndef CC_TREES_PROXY_H_
 #define CC_TREES_PROXY_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 60 matching lines @@
   virtual void Start(
       std::unique_ptr<BeginFrameSource> external_begin_frame_source) = 0;
   virtual void Stop() = 0;   // Must be called before deleting the proxy.
 
   virtual bool SupportsImplScrolling() const = 0;
 
   virtual void UpdateTopControlsState(TopControlsState constraints,
                                       TopControlsState current,
                                       bool animate) = 0;
 
-  virtual void SetOutputIsSecure(bool output_is_secure) = 0;
-
   // Testing hooks
   virtual bool MainFrameWillHappenForTesting() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_