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

chrome/browser/devtools/devtools_target_impl.h

Index: chrome/browser/devtools/devtools_target_impl.h
diff --git a/chrome/browser/devtools/devtools_target_impl.h b/chrome/browser/devtools/devtools_target_impl.h
index 484278844b64d8e3fdf85a6af6cce61b88d3f7c7..66a058a73b5f1156614edb4249004b4ec672cca9 100644
--- a/chrome/browser/devtools/devtools_target_impl.h
+++ b/chrome/browser/devtools/devtools_target_impl.h
@@ -25,6 +25,7 @@ class DevToolsTargetImpl : public content::DevToolsTarget {
 
   // content::DevToolsTarget overrides:
   virtual std::string GetId() const OVERRIDE;
+  virtual std::string GetParentId() const OVERRIDE;
   virtual std::string GetType() const OVERRIDE;
   virtual std::string GetTitle() const OVERRIDE;
   virtual std::string GetDescription() const OVERRIDE;
@@ -58,6 +59,7 @@ class DevToolsTargetImpl : public content::DevToolsTarget {
   static scoped_ptr<DevToolsTargetImpl> CreateForRenderViewHost(
       content::RenderViewHost*, bool is_tab);
 
+  void set_parent_id(const std::string& parent_id) { parent_id_ = parent_id; }
   void set_type(const std::string& type) { type_ = type; }
   void set_title(const std::string& title) { title_ = title; }
   void set_description(const std::string& desc) { description_ = desc; }
@@ -76,7 +78,7 @@ class DevToolsTargetImpl : public content::DevToolsTarget {
 
  private:
   scoped_refptr<content::DevToolsAgentHost> agent_host_;
-  std::string id_;
+  std::string parent_id_;
   std::string type_;
   std::string title_;
   std::string description_;