Disable agents when client disconnects

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;
+  virtual void Disable() = 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) {
+  // UiDevToolsAgent:
+  void Init(protocol::UberDispatcher* dispatcher) override {
     frontend_.reset(
         new typename DomainMetainfo::FrontendClass(dispatcher->channel()));
     DomainMetainfo::DispatcherClass::wire(dispatcher, this);
   }
 
+  void Disable() override { disable(); }
+
+  // Common methods between all generated Backends, subclasses may
+  // choose to override them (but not necessary).
+  ui::devtools::protocol::Response enable() override {
+    return ui::devtools::protocol::Response::OK();
+  };
+
+  ui::devtools::protocol::Response disable() override {
+    return ui::devtools::protocol::Response::OK();
+  };
+
  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_