cc: Move UI Resource management out of LayerTreeHost.

cc/resources/scoped_ui_resource.h

 // Copyright 2013 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.
 
 #ifndef CC_RESOURCES_SCOPED_UI_RESOURCE_H_
 #define CC_RESOURCES_SCOPED_UI_RESOURCE_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/resources/ui_resource_client.h"
 
 namespace cc {
 
-class LayerTreeHost;
+class UIResourceManager;
 
 // ScopedUIResource creates an UIResource from a bitmap and a LayerTreeHost.
 // This class holds a pointer to the host so that when the instance goes out of
 // scope, the created resource is deleted.  On a GetBitmap call from the
 // UIResource manager, ScopeUIResource always returns the reference to the
 // initially given bitmap regardless of whether the request was due to lost
 // resource or not.
 class CC_EXPORT ScopedUIResource : public UIResourceClient {
  public:
   static std::unique_ptr<ScopedUIResource> Create(
-      LayerTreeHost* host,
+      UIResourceManager* ui_resource_manager,
       const UIResourceBitmap& bitmap);
   ~ScopedUIResource() override;
 
   // UIResourceClient implementation.
   UIResourceBitmap GetBitmap(UIResourceId uid, bool resource_lost) override;
   UIResourceId id() { return id_; }
 
  protected:
-  ScopedUIResource(LayerTreeHost* host, const UIResourceBitmap& bitmap);
+  ScopedUIResource(UIResourceManager* ui_resource_manager,
+                   const UIResourceBitmap& bitmap);
 
   UIResourceBitmap bitmap_;
-  LayerTreeHost* host_;
+  UIResourceManager* ui_resource_manager_;
   UIResourceId id_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedUIResource);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_SCOPED_UI_RESOURCE_H_