Add hints for potential overlay promotion on android.

cc/output/overlay_candidate.h

 // 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.
 
 #ifndef CC_OUTPUT_OVERLAY_CANDIDATE_H_
 #define CC_OUTPUT_OVERLAY_CANDIDATE_H_
 
 #include <vector>
 
 #include "cc/base/cc_export.h"
@@ skipping 52 matching lines @@
   gfx::Rect quad_rect_in_target_space;
   // Clip rect in the target content space after composition.
   gfx::Rect clip_rect;
   // If the quad is clipped after composition.
   bool is_clipped;
   // True if the texture for this overlay should be the same one used by the
   // output surface's main overlay.
   bool use_output_surface_for_resource;
   // Texture resource to present in an overlay.
   unsigned resource_id;
+
+#if defined(OS_ANDROID)
+  // For candidates from StreamVideoDrawQuads, this records whether the quad is
+  // marked as being backed by a SurfaceTexture or not.  If so, it's not really
+  // promotable to an overlay.
+  bool is_backed_by_surface_texture;
+#endif
+
   // Stacking order of the overlay plane relative to the main surface,
   // which is 0. Signed to allow for "underlays".
   int plane_z_order;
   // True if the overlay does not have any visible quads on top of it. Set by
   // the strategy so the OverlayProcessor can consider subtracting damage caused
   // by underlay quads.
   bool is_unoccluded;
 
   // To be modified by the implementer if this candidate can go into
   // an overlay.
   bool overlay_handled;
 
  private:
   static bool FromTextureQuad(ResourceProvider* resource_provider,
                               const TextureDrawQuad* quad,
                               OverlayCandidate* candidate);
   static bool FromStreamVideoQuad(ResourceProvider* resource_provider,
                                   const StreamVideoDrawQuad* quad,
                                   OverlayCandidate* candidate);
 };
 
 typedef std::vector<OverlayCandidate> OverlayCandidateList;
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_CANDIDATE_H_