cc: Enable non-opaque harware overlays.

cc/output/overlay_strategy_fullscreen.cc

 // Copyright 2016 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.
 
 #include "cc/output/overlay_strategy_fullscreen.h"
 
 #include "cc/base/math_util.h"
 #include "cc/output/overlay_candidate_validator.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
@@ skipping 21 matching lines @@
   while (front != quad_list->end()) {
     if (!OverlayCandidate::IsInvisibleQuad(*front))
       break;
     front++;
   }
 
   if (front == quad_list->end())
     return false;
 
   const DrawQuad* quad = *front;
-  if (quad->ShouldDrawWithBlending() ||
-      quad->shared_quad_state->opacity != 1.f ||
-      quad->shared_quad_state->blend_mode != SkBlendMode::kSrcOver)
+  if (quad->ShouldDrawWithBlending())
     return false;
 
   OverlayCandidate candidate;
   if (!OverlayCandidate::FromDrawQuad(resource_provider, quad, &candidate)) {
     return false;
   }
 
   if (candidate.transform != gfx::OVERLAY_TRANSFORM_NONE) {
     return false;
   }
@@ skipping 13 matching lines @@
   if (!new_candidate_list.front().overlay_handled)
     return false;
 
   candidate_list->swap(new_candidate_list);
 
   render_pass->quad_list = QuadList();  // Remove all the quads
   return true;
 }
 
 }  // namespace cc