Create a base agent class for ui_devtools

components/ui_devtools/devtools_base_agent.h

+// Copyright 2016 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 COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_
+#define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_
+
+#include "components/ui_devtools/Protocol.h"
+
+namespace ui {
+namespace devtools {
+
+class UiDevToolsAgent {
+ public:
+  UiDevToolsAgent() {}
+  virtual ~UiDevToolsAgent() {}
+
+  virtual void Init(protocol::UberDispatcher*) = 0;
+};
+
+// A base agent so that any Backend implementation has access to the
+// corresponding frontend instance. This also wires the backend with
+// the dispatcher. When initializing an instance of this class,
+// the template argument is simply the generated Metainfo class of
+// any domain type such as DOM or CSS.
+template <typename DomainMetainfo>
+class UiDevToolsBaseAgent : public UiDevToolsAgent,
+                            public DomainMetainfo::BackendClass {
+ public:
+  void Init(protocol::UberDispatcher* dispatcher) {
+    frontend_.reset(
+        new typename DomainMetainfo::FrontendClass(dispatcher->channel()));
+    DomainMetainfo::DispatcherClass::wire(dispatcher, this);
+  }
+
+ protected:
+  UiDevToolsBaseAgent() {}
+  typename DomainMetainfo::FrontendClass* frontend() const {
+    return frontend_.get();
+  }
+
+ private:
+  std::unique_ptr<typename DomainMetainfo::FrontendClass> frontend_;
+
+  DISALLOW_COPY_AND_ASSIGN(UiDevToolsBaseAgent);
+};
+
+}  // namespace devtools
+}  // namespace ui
+
+#endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_