Add hints for potential overlay promotion on android.

components/display_compositor/compositor_overlay_candidate_validator_android.h

 // 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.
 
 #ifndef COMPONENTS_DISPLAY_COMPOSITOR_COMPOSITOR_OVERLAY_CANDIDATE_VALIDATOR_ANDROID_H_
 #define COMPONENTS_DISPLAY_COMPOSITOR_COMPOSITOR_OVERLAY_CANDIDATE_VALIDATOR_ANDROID_H_
 
+#include <set>
+
 #include "base/macros.h"
 #include "components/display_compositor/compositor_overlay_candidate_validator.h"
 #include "components/display_compositor/display_compositor_export.h"
 
+namespace cc {
+class DrawQuad;
+class OverlayPromotabilityCallback;
+class ResourceProvider;
+class RenderPass;
+}
+
 namespace display_compositor {
 
 // An overlay validator for supporting fullscreen video underlays on Android.
 // Things are a bit different on Android compared with other platforms. By the
 // time a video frame is marked as overlayable it means the video decoder was
 // outputting to a Surface that we can't read back from. As a result, the
 // overlay must always succeed, or the video won't be visible. This is one of of
 // the reasons that only fullscreen is supported: we have to be sure that
 // nothing will cause the overlay to be rejected, because there's no fallback to
 // gl compositing.
 class DISPLAY_COMPOSITOR_EXPORT CompositorOverlayCandidateValidatorAndroid
     : public CompositorOverlayCandidateValidator {
  public:
   CompositorOverlayCandidateValidatorAndroid();
   ~CompositorOverlayCandidateValidatorAndroid() override;
 
   void GetStrategies(cc::OverlayProcessor::StrategyList* strategies) override;
   void CheckOverlaySupport(cc::OverlayCandidateList* surfaces) override;
   bool AllowCALayerOverlays() override;
 
   void SetSoftwareMirrorMode(bool enabled) override;
 
+  void ClearPromotableResources() override;
+
+  bool IsResourcePromotable(cc::ResourceId resource_id) override;
+
  private:
+  std::set<cc::ResourceId> promotable_resources_;
+
   DISALLOW_COPY_AND_ASSIGN(CompositorOverlayCandidateValidatorAndroid);
 };
 
 }  // namespace display_compositor
 
 #endif  // COMPONENTS_DISPLAY_COMPOSITOR_COMPOSITOR_OVERLAY_CANDIDATE_VALIDATOR_ANDROID_H_