Make content_shell talk to run_webkit_tests.py

content/shell/shell_switches.cc

Index: content/shell/shell_switches.cc
diff --git a/content/shell/shell_switches.cc b/content/shell/shell_switches.cc
index 0411cf209ca56b8b352bce077b10b16be91e686d..4a392f5b26ce16966678c8617df7fc2f242a79ff 100644
--- a/content/shell/shell_switches.cc
+++ b/content/shell/shell_switches.cc
@@ -6,6 +6,9 @@
 
 namespace switches {
 
+// Check whether all system dependencies for running layout tests are met.
+const char kCheckLayoutTestSysDeps[] = "check-layout-test-sys-deps";
+
 // Request pages to be dumped as text once they finished loading.
 const char kDumpRenderTree[] = "dump-render-tree";