DevTools: pass agent host id to the renderer (Blink).

public/web/WebDevToolsAgent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 class WebView;
 struct WebDevToolsMessageData;
 struct WebPoint;
 struct WebMemoryUsageInfo;
 struct WebURLError;
 
 class WebDevToolsAgent {
 public:
     virtual ~WebDevToolsAgent() {}
 
+    // FIXME: remove once migrated to the one with host_id.
     virtual void attach() = 0;
     virtual void reattach(const WebString& savedState) = 0;
+
+    virtual void attach(const WebString& hostId) = 0;
+    virtual void reattach(const WebString& hostId, const WebString& savedState) = 0;
     virtual void detach() = 0;
 
     virtual void didNavigate() = 0;
 
     virtual void dispatchOnInspectorBackend(const WebString& message) = 0;
 
     virtual void inspectElementAt(const WebPoint&) = 0;
     virtual void setProcessId(long) = 0;
     virtual void setLayerTreeId(int) = 0;
 
@@ skipping 30 matching lines @@
     // Asynchronously request debugger to pause immediately and run the command.
     BLINK_EXPORT static void interruptAndDispatch(MessageDescriptor*);
     BLINK_EXPORT static bool shouldInterruptForMessage(const WebString&);
     BLINK_EXPORT static void processPendingMessages();
 
 };
 
 } // namespace blink
 
 #endif