cc: Add OverlayStrategyFullscreen strategy.

cc/output/overlay_candidate.cc

 // 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.
 
 #include "cc/output/overlay_candidate.h"
 
 #include <algorithm>
 #include <limits>
 #include "base/logging.h"
 #include "cc/base/math_util.h"
@@ skipping 199 matching lines @@
                                  candidate);
     default:
       break;
   }
 
   return false;
 }
 
 // static
 bool OverlayCandidate::IsInvisibleQuad(const DrawQuad* quad) {
+  float opacity = quad->shared_quad_state->opacity;
+  if (opacity < std::numeric_limits<float>::epsilon())
+    return true;
   if (quad->material == DrawQuad::SOLID_COLOR) {
     SkColor color = SolidColorDrawQuad::MaterialCast(quad)->color;
-    float opacity = quad->shared_quad_state->opacity;
     float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
     return quad->ShouldDrawWithBlending() &&
            alpha < std::numeric_limits<float>::epsilon();
   }
   return false;
 }
 
 // static
 bool OverlayCandidate::IsOccluded(const OverlayCandidate& candidate,
                                   QuadList::ConstIterator quad_list_begin,
@@ skipping 69 matching lines @@
     candidate->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
   } else {
     candidate->transform = ComposeTransforms(
         gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL, candidate->transform);
     candidate->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
   }
   return true;
 }
 
 }  // namespace cc