Content API changes to integrate base/graph.

content/public/browser/graph/browser_context_dependency_visitor_impl.h

+// Copyright (c) 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 CONTENT_PUBLIC_BROWSER_GRAPH_BROWSER_CONTEXT_DEPENDENCY_VISITOR_IMPL_H_
+#define CONTENT_PUBLIC_BROWSER_GRAPH_BROWSER_CONTEXT_DEPENDENCY_VISITOR_IMPL_H_
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/graph/dependency_manager_instance.h"
+#include "content/public/browser/graph/browser_context_dependency_visitor.h"
+
+namespace content {
+
+template <typename Component>
+class BrowserContextDependencyVisitorImpl
+    : public BrowserContextDependencyVisitor {
+ public:
+  explicit BrowserContextDependencyVisitorImpl(
+      const base::Callback<void(Component*)>& completion_callback)
+      : completion_callback_(completion_callback) {}
+
+  virtual void Visit(
+      graph::DependencyManagerInstance* dependency_manager) OVERRIDE {
+    if (dependency_manager)
+      dependency_manager->Get<Component>(completion_callback_);
+    else
+      completion_callback_.Run(NULL);
+  }
+
+ private:
+  base::Callback<void(Component*)> completion_callback_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_GRAPH_BROWSER_CONTEXT_DEPENDENCY_VISITOR_IMPL_H_