Use WaitForDebuggerChildren to let renderer wait for gdb

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 1747428ae9ed723e27df0c3ee1f4e105c2d79893..abf0503c5779bdd976ca57b21c00a26f125924b7 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -919,6 +919,9 @@ const char kEnableWin32kRendererLockDown[]
     = "enable_win32k_renderer_lockdown";
 #endif
 
+// Will add kWaitForDebugger to every renderer processes.
+const char kWaitForDebuggerRenderer[]        = "wait-for-debugger-renderer";
+
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches