[DevTools] Support multiple clients in DevToolsAgentHost

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 43b7dea33ce3cea69bd3127bb5efdaa454528b0a..11147f08258a2eb3192803a9efdf948c1ea967c0 100644
--- a/content/public/browser/devtools_agent_host.h
+++ b/content/public/browser/devtools_agent_host.h
@@ -144,6 +144,11 @@ class CONTENT_EXPORT DevToolsAgentHost
   // any existing clients.
   virtual void ForceAttachClient(DevToolsAgentHostClient* client) = 0;
 
+  // Attaches |client| to this agent host to start debugging. This method
+  // can attach more than one client (as opposite to AttachClient).
+  // Returns true iff attach succeeded.
+  virtual bool AttachMultiClient(DevToolsAgentHostClient* client) = 0;
+
   // Already attached client detaches from this agent host to stop debugging it.
   // Returns true iff detach succeeded.
   virtual bool DetachClient(DevToolsAgentHostClient* client) = 0;