[DevTools] Implement Target.setDiscoverTargets method.

content/browser/devtools/devtools_manager.h

 // Copyright (c) 2012 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_BROWSER_DEVTOOLS_DEVTOOLS_MANAGER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_MANAGER_H_
 
 #include <memory>
+#include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
+#include "base/observer_list.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/devtools_manager_delegate.h"
 
 namespace content {
 
 class DevToolsAgentHostImpl;
 class DevToolsHttpHandler;
+class WebContentsImpl;
 
 // This class is a singleton that manage global DevTools state for the whole
 // browser.
-// TODO(dgozman): remove this class entirely.
 class CONTENT_EXPORT DevToolsManager {
  public:
   // Returns single instance of this class. The instance is destroyed on the
   // browser main loop exit so this method MUST NOT be called after that point.
   static DevToolsManager* GetInstance();
 
+  class Observer {
+   public:
+    virtual void AgentHostCreated(DevToolsAgentHostImpl* agent_host) {}
+    virtual void AgentHostDestroyed(DevToolsAgentHostImpl* agent_host) {}
+    virtual ~Observer() {}
+  };
+
   DevToolsManager();
   virtual ~DevToolsManager();
 
-  DevToolsManagerDelegate* delegate() const { return delegate_.get(); }
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
 
+  DevToolsManagerDelegate* GetDelegate();
+
+  void WebContentsCreated(WebContentsImpl* web_contents);

[pfeldman, 2016/10/12 23:11:18]

These seem random / hacky.

[dgozman, 2016/10/12 23:23:12]

Any ideas?

+  void AgentHostCreated(DevToolsAgentHostImpl* agent_host);
+  void AgentHostDestroyed(DevToolsAgentHostImpl* agent_host);
   void AgentHostStateChanged(DevToolsAgentHostImpl* agent_host, bool attached);
 
   void SetHttpHandler(std::unique_ptr<DevToolsHttpHandler> http_handler);
 
  private:
   friend struct base::DefaultSingletonTraits<DevToolsManager>;
 
+  bool delegate_initialized_;
   std::unique_ptr<DevToolsManagerDelegate> delegate_;
   std::unique_ptr<DevToolsHttpHandler> http_handler_;
   int attached_hosts_count_;
+  std::set<DevToolsAgentHostImpl*> agent_hosts_;
+  base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_MANAGER_H_