Use kRenderClientId command line flag when starting a render process

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index ba97b3c4a9940536516a03d7d10b9730ac525e74..b76f71f61bce3403201aafe18cf97fbe685f9d1d 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -748,6 +748,8 @@ const char kRegisterPepperPlugins[]         = "register-pepper-plugins";
 // Enables remote debug over HTTP on the specified port.
 const char kRemoteDebuggingPort[]           = "remote-debugging-port";
 
+const char kRendererClientId[] = "renderer-client-id";
+
 // The contents of this flag are prepended to the renderer command line.
 // Useful values might be "valgrind" or "xterm -e gdb --args".
 const char kRendererCmdPrefix[]             = "renderer-cmd-prefix";