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..9a616341ca74659ec0a2c8b4819f2c744a2dceda 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 {
 
@@ -45,6 +46,24 @@ class CONTENT_EXPORT DevToolsAgentHost
   static void ConnectRenderViewHost(int agent_host_cookie,
                                     RenderViewHost* rvh);
 
+  // Returns the unique id of the agent.
+  virtual int id() = 0;
+
+  // Returns true if the debugger is attached.
+  virtual bool attached() = 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;