Revert "cc: Remove Tile refcounting and RefCountedManaged."

cc/base/ref_counted_managed.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_BASE_REF_COUNTED_MANAGED_H_
+#define CC_BASE_REF_COUNTED_MANAGED_H_
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+template <typename T> class RefCountedManaged;
+
+template <typename T>
+class CC_EXPORT RefCountedManager {
+ protected:
+  RefCountedManager() : live_object_count_(0) {}
+  ~RefCountedManager() {
+    CHECK_EQ(0, live_object_count_);
+  }
+
+  virtual void Release(T* object) = 0;
+
+ private:
+  friend class RefCountedManaged<T>;
+  int live_object_count_;
+};
+
+template <typename T>
+class CC_EXPORT RefCountedManaged : public base::subtle::RefCountedBase {
+ public:
+  explicit RefCountedManaged(RefCountedManager<T>* manager)
+      : manager_(manager) {
+    manager_->live_object_count_++;
+  }
+
+  void AddRef() const {
+    base::subtle::RefCountedBase::AddRef();
+  }
+
+  void Release() {
+    if (base::subtle::RefCountedBase::Release()) {
+      DCHECK_GT(manager_->live_object_count_, 0);
+      manager_->live_object_count_--;
+
+      // This must be the last statement in case manager deletes
+      // the object immediately.
+      manager_->Release(static_cast<T*>(this));
+    }
+  }
+
+ protected:
+  ~RefCountedManaged() {}
+
+ private:
+  RefCountedManager<T>* manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedManaged<T>);
+};
+
+}  // namespace cc
+
+#endif  // CC_BASE_REF_COUNTED_MANAGED_H_