Revert of Avoid Copying damage rect when using Overlays

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 48 matching lines @@
   // 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;
   // Stacking order of the overlay plane relative to the main surface,
   // which is 0. Signed to allow for "underlays".
   int plane_z_order;
-  // If the overlay needs blending support.
-  bool needs_blending;
 
   // 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);
   static bool FromIOSurfaceQuad(ResourceProvider* resource_provider,
                                 const IOSurfaceDrawQuad* quad,
                                 OverlayCandidate* candidate);
 };
 
 typedef std::vector<OverlayCandidate> OverlayCandidateList;
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_CANDIDATE_H_