Adds a command line switch to allow the user to specify the location...

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
===================================================================
--- chrome/common/chrome_switches.cc	(revision 9343)
+++ chrome/common/chrome_switches.cc	(working copy)
@@ -112,6 +112,10 @@
 // for all of its state.
 const wchar_t kUserDataDir[]                   = L"user-data-dir";
 
+// Use a specific disk cache location, rather than one derived
+// from the UserDatadir.
+const wchar_t kDiskCacheDir[]                  = L"disk-cache-dir";
+
 // Specifies the plugin data directory, which is where plugins (Gears
 // specifically) will store its state.
 const wchar_t kPluginDataDir[]                 = L"plugin-data-dir";