DevTools: Add parent id to target descriptor in remote debugging.

content/public/browser/devtools_target.h

 // Copyright 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_DEVTOOLS_TARGET_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_TARGET_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 10 matching lines @@
 // manipulate the target and query its details.
 // Instantiation and discovery of DevToolsTarget instances is the responsibility
 // of DevToolsHttpHandlerDelegate.
 class DevToolsTarget {
  public:
   virtual ~DevToolsTarget() {}
 
   // Returns the unique target id.
   virtual std::string GetId() const = 0;
 
+  // Returns the id of the parent target, or empty string if no parent.
+  virtual std::string GetParentId() const = 0;
+
   // Returns the target type.
   virtual std::string GetType() const = 0;
 
   // Returns the target title.
   virtual std::string GetTitle() const = 0;
 
   // Returns the target description.
   virtual std::string GetDescription() const = 0;
 
   // Returns the url associated with this target.
@@ skipping 14 matching lines @@
   // Activates the target. Returns false if the operation failed.
   virtual bool Activate() const = 0;
 
   // Closes the target. Returns false if the operation failed.
   virtual bool Close() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_TARGET_H_