cc: Replace Region with SimpleEnclosedRegion for occlusion tracking

cc/layers/texture_layer.cc

 // Copyright 2010 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.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/synchronization/lock.h"
+#include "cc/base/simple_enclosed_region.h"
 #include "cc/layers/texture_layer_client.h"
 #include "cc/layers/texture_layer_impl.h"
 #include "cc/resources/single_release_callback.h"
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
 
 namespace cc {
 
 scoped_refptr<TextureLayer> TextureLayer::CreateForMailbox(
     TextureLayerClient* client) {
@@ skipping 226 matching lines @@
     if (holder_ref_) {
       TextureMailboxHolder* holder = holder_ref_->holder();
       texture_mailbox = holder->mailbox();
       release_callback = holder->GetCallbackForImplThread();
     }
     texture_layer->SetTextureMailbox(texture_mailbox, release_callback.Pass());
     needs_set_mailbox_ = false;
   }
 }
 
-Region TextureLayer::VisibleContentOpaqueRegion() const {
+SimpleEnclosedRegion TextureLayer::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();
 }
 
 TextureLayer::TextureMailboxHolder::MainThreadReference::MainThreadReference(
     TextureMailboxHolder* holder)
     : holder_(holder) {
   holder_->InternalAddRef();
 }
 
 TextureLayer::TextureMailboxHolder::MainThreadReference::
     ~MainThreadReference() {
@@ skipping 54 matching lines @@
 
 void TextureLayer::TextureMailboxHolder::ReturnAndReleaseOnImplThread(
     uint32 sync_point,
     bool is_lost) {
   Return(sync_point, is_lost);
   message_loop_->PostTask(
       FROM_HERE, base::Bind(&TextureMailboxHolder::InternalRelease, this));
 }
 
 }  // namespace cc