Add support to send optimal format as part of ScheduleOverlayPlane

ui/ozone/public/overlay_candidates_ozone.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 UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_
 #define UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 26 matching lines @@
     gfx::RectF crop_rect;
     // Quad geometry rect after applying the quad_transform().
     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;
     // Stacking order of the overlay plane relative to the main surface,
     // which is 0. Signed to allow for "underlays".
     int plane_z_order = 0;
-
+    // If any scaling requirements need to be handled before composition.
+    bool handle_scaling = true;
     // To be modified by the implementer if this candidate can go into
     // an overlay.
     bool overlay_handled = false;
   };
 
   typedef std::vector<OverlaySurfaceCandidate> OverlaySurfaceCandidateList;
 
   // A list of possible overlay candidates is presented to this function.
   // The expected result is that those candidates that can be in a separate
   // plane are marked with |overlay_handled| set to true, otherwise they are
   // to be traditionally composited. When setting |overlay_handled| to true,
   // the implementation must also snap |display_rect| to integer coordinates
   // if necessary.
   virtual void CheckOverlaySupport(OverlaySurfaceCandidateList* surfaces);
 
   virtual ~OverlayCandidatesOzone();
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_