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"
+#include "cc/base/resource_id.h"
 #include "cc/quads/render_pass.h"
 #include "cc/resources/resource_format.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/overlay_transform.h"
 #include "ui/gfx/transform.h"
 
 namespace gfx {
 class Rect;
@@ skipping 42 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;
+
+  // Filled in by the OverlayCandidateValidator to indicate whether this is a
+  // promotable candidate or not.
+  bool is_promotable_hint;
+#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;
+class OverlayCandidateList : public std::vector<OverlayCandidate> {
+ public:
+  OverlayCandidateList();
+  OverlayCandidateList(const OverlayCandidateList&);

[piman, 2016/12/01 21:55:25]

nit: rule-of-3? (i.e. add a copy-assignment operator)
maybe make it moveable too (i.e rule-of-5, add move constructor and
move-assignment operator)?

[liberato (no reviews please), 2016/12/05 18:14:01]

Done.

+  ~OverlayCandidateList();
+
+  // For android, this provides a set of resources that could be promoted to
+  // overlay, if one backs them with a SurfaceView.
+  ResourceIdSet promotable_resource_hints_;
+};
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_CANDIDATE_H_