DevTools: retain DTAH in all the targets to match their life time.

chrome/browser/android/tab_android.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 CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 23 matching lines @@
 namespace chrome {
 struct NavigateParams;
 }
 
 namespace android {
 class TabWebContentsDelegateAndroid;
 class TabContentManager;
 }
 
 namespace content {
+class DevToolsAgentHost;
 class WebContents;
 }
 
 namespace prerender {
 class PrerenderManager;
 }
 
 class TabAndroid : public CoreTabHelperDelegate,
                    public content::NotificationObserver,
                    public favicon::FaviconDriverObserver {
@@ skipping 191 matching lines @@
     return webapp_manifest_scope_;
   }
 
   void EnableEmbeddedMediaExperience(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jboolean enabled);
 
   bool ShouldEnableEmbeddedMediaExperience() const;
 
+  scoped_refptr<content::DevToolsAgentHost> GetDevToolsAgentHost();
+
+  void SetDevToolsAgentHost(scoped_refptr<content::DevToolsAgentHost> host);
+
   // Register the Tab's native methods through JNI.
   static bool RegisterTabAndroid(JNIEnv* env);
 
  private:
   prerender::PrerenderManager* GetPrerenderManager() const;
 
   JavaObjectWeakGlobalRef weak_java_tab_;
 
   // The identifier used by session restore for this tab.
   SessionID session_tab_id_;
 
   // Identifier of the window the tab is in.
   SessionID session_window_id_;
 
   content::NotificationRegistrar notification_registrar_;
 
   scoped_refptr<cc::Layer> content_layer_;
   android::TabContentManager* tab_content_manager_;
 
   std::unique_ptr<content::WebContents> web_contents_;
   std::unique_ptr<android::TabWebContentsDelegateAndroid>
       web_contents_delegate_;
-
+  scoped_refptr<content::DevToolsAgentHost> devtools_host_;
   std::unique_ptr<browser_sync::SyncedTabDelegateAndroid> synced_tab_delegate_;
 
   std::string webapp_manifest_scope_;
   bool embedded_media_experience_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(TabAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_TAB_ANDROID_H_