Disable fullscren fb optimization with sw mirroring.

cc/output/overlay_strategy_fullscreen.h

 // Copyright 2016 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_OUTPUT_OVERLAY_STRATEGY_FULLSCREEN_H_
 #define CC_OUTPUT_OVERLAY_STRATEGY_FULLSCREEN_H_
 
 #include "base/macros.h"
 #include "cc/output/overlay_processor.h"
 
 namespace cc {
 
 class OverlayCandidateValidator;
 // Overlay strategy to promote a single full screen quad to an overlay.
 // The promoted quad should have all the property of the framebuffer and it
 // should be possible to use it as such.
 class CC_EXPORT OverlayStrategyFullscreen : public OverlayProcessor::Strategy {
  public:
-  OverlayStrategyFullscreen();
+  explicit OverlayStrategyFullscreen(
+      OverlayCandidateValidator* capability_checker);
   ~OverlayStrategyFullscreen() override;
 
   bool Attempt(ResourceProvider* resource_provider,
                RenderPass* render_pass,
                OverlayCandidateList* candidate_list) override;
 
  private:
+  OverlayCandidateValidator* capability_checker_;  // Weak.
+
   DISALLOW_COPY_AND_ASSIGN(OverlayStrategyFullscreen);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_STRATEGY_FULLSCREEN_H_