[DevTools] Pass client initiating DevToolsAgentHost::inspectElement.

content/renderer/devtools/devtools_agent.h

Index: content/renderer/devtools/devtools_agent.h
diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
index 5114bc71a3ddc9567016df45a0b849c2dd98a4a9..77069582336693f7ab1a8cb3816c6d077dfbbff6 100644
--- a/content/renderer/devtools/devtools_agent.h
+++ b/content/renderer/devtools/devtools_agent.h
@@ -88,7 +88,7 @@ class CONTENT_EXPORT DevToolsAgent
                                     int call_id,
                                     const std::string& method,
                                     const std::string& message);
-  void OnInspectElement(int x, int y);
+  void OnInspectElement(int session_id, int x, int y);
   void OnRequestNewWindowACK(bool success);
   void ContinueProgram();
   void OnSetupDevToolsClient(const std::string& compatibility_script);