Add initial device policy infrastructure.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 65f40a80290043304b828bc97256e18230a5fe4c..11e4ae8d195727ce635f06314bc80c37390d82aa 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -145,6 +145,10 @@ const char kCountry[]                       = "country";
 // Enables support to debug printing subsystem.
 const char kDebugPrint[]                    = "debug-print";
 
+// Specifies the directory in which to store the shared device policy cache
+// file. If not specified, device policy will be disabled.
+const char kDevicePolicyCacheDir[]          = "device-policy-cache-dir";
+
 // Specifies the URL at which to fetch configuration policy from the device
 // management backend. Specifying this switch turns on managed policy from the
 // device management backend.