Extract debugger target enumeration into a separate class

content/public/browser/devtools_agent_host.h

Index: content/public/browser/devtools_agent_host.h
diff --git a/content/public/browser/devtools_agent_host.h b/content/public/browser/devtools_agent_host.h
index 533c31df79f1545ef84ab2f450590b77339aa4a0..a056645300a9c7a38e10f2e0cf4e8dc9a69ba1a7 100644
--- a/content/public/browser/devtools_agent_host.h
+++ b/content/public/browser/devtools_agent_host.h
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
+#include "googleurl/src/gurl.h"
 
 namespace content {
 
@@ -35,16 +36,33 @@ class CONTENT_EXPORT DevToolsAgentHost
 
   static bool IsDebuggerAttached(WebContents* web_contents);
 
+  static const std::string EmptyCookie;
+
   // Detaches given |rvh| from the agent host temporarily and returns a cookie
-  // that allows to reattach another rvh to that agen thost later. Returns -1 if
-  // there is no agent host associated with the |rvh|.
-  static int DisconnectRenderViewHost(RenderViewHost* rvh);
+  // that allows to reattach another rvh to that agen thost later.
+  // ReturnsEmptyCookie if there is no agent host associated with the |rvh|.
+  static std::string DisconnectRenderViewHost(RenderViewHost* rvh);
 
   // Reattaches agent host detached with DisconnectRenderViewHost method above
   // to |rvh|.
-  static void ConnectRenderViewHost(int agent_host_cookie,
+  static void ConnectRenderViewHost(const std::string& agent_host_cookie,
                                     RenderViewHost* rvh);
 
+  // Returns the unique id of the agent.
+  virtual std::string id() = 0;
+
+  // Returns the page title.
+  virtual std::string title() = 0;
+
+  // Returns the page url.
+  virtual GURL url() = 0;
+
+  // Returns thumbnail url for the page.
+  virtual GURL thumbnail_url() = 0;
+
+  // Returns favicon url for the page.
+  virtual GURL favicon_url() = 0;
+
   // Returns render view host instance for this host if any.
   virtual RenderViewHost* GetRenderViewHost() = 0;