[2/5] Disable transformed rasterization if layer is opaque

cc/layers/picture_layer_impl.cc

 // Copyright 2012 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/layers/picture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 641 matching lines @@
     AddDamageRect(layer_damage_rect);
   }
   if (tile->draw_info().NeedsRaster()) {
     PictureLayerTiling* tiling =
         tilings_->FindTilingWithScaleKey(tile->contents_scale());
     if (tiling)
       tiling->set_all_tiles_done(false);
   }
 }
 
+SimpleEnclosedRegion PictureLayerImpl::VisibleOpaqueRegion() const {
+  if (use_transformed_rasterization_)
+    return SimpleEnclosedRegion();
+  return LayerImpl::VisibleOpaqueRegion();
+}
+
 void PictureLayerImpl::DidBeginTracing() {
   raster_source_->DidBeginTracing();
 }
 
 void PictureLayerImpl::ReleaseResources() {
   // Recreate tilings with new settings, since some of those might change when
   // we release resources.
   tilings_ = nullptr;
   ResetRasterScale();
 }
@@ skipping 730 matching lines @@
   }
 
   invalidation_.Union(invalidation);
   tilings_->UpdateTilingsForImplSideInvalidation(invalidation);
   SetNeedsPushProperties();
   TRACE_EVENT_END1("cc", "PictureLayerImpl::InvalidateRegionForImages",
                    "Invalidation", invalidation.ToString());
 }
 
 }  // namespace cc