cc: Replace Region with SimpleEnclosedRegion for occlusion tracking

cc/layers/texture_layer_impl.cc

 // Copyright 2011 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/texture_layer_impl.h"
 
 #include <vector>
 
 #include "base/strings/stringprintf.h"
 #include "cc/output/renderer.h"
@@ skipping 162 matching lines @@
                visible_quad_rect,
                id,
                premultiplied_alpha_,
                uv_top_left_,
                uv_bottom_right_,
                bg_color,
                vertex_opacity_,
                flipped_);
 }
 
-Region TextureLayerImpl::VisibleContentOpaqueRegion() const {
+SimpleEnclosedRegion TextureLayerImpl::VisibleContentOpaqueRegion() const {
   if (contents_opaque())
-    return visible_content_rect();
+    return SimpleEnclosedRegion(visible_content_rect());
 
   if (blend_background_color_ && (SkColorGetA(background_color()) == 0xFF))
-    return visible_content_rect();
+    return SimpleEnclosedRegion(visible_content_rect());
 
-  return Region();
+  return SimpleEnclosedRegion();
 }
 
 void TextureLayerImpl::ReleaseResources() {
   FreeTextureMailbox();
   texture_copy_.reset();
   external_texture_resource_ = 0;
   valid_texture_copy_ = false;
 }
 
 void TextureLayerImpl::SetPremultipliedAlpha(bool premultiplied_alpha) {
@@ skipping 46 matching lines @@
   } else if (external_texture_resource_) {
     DCHECK(!own_mailbox_);
     ResourceProvider* resource_provider =
         layer_tree_impl()->resource_provider();
     resource_provider->DeleteResource(external_texture_resource_);
     external_texture_resource_ = 0;
   }
 }
 
 }  // namespace cc