Add policies to control the disk cache size.

chrome/browser/prefs/command_line_pref_store.h

Index: chrome/browser/prefs/command_line_pref_store.h
diff --git a/chrome/browser/prefs/command_line_pref_store.h b/chrome/browser/prefs/command_line_pref_store.h
index 5555b189a9868c19fe63e3c65685263275af5e8d..b236df98c9dd8648948a11abf8b323081b282527 100644
--- a/chrome/browser/prefs/command_line_pref_store.h
+++ b/chrome/browser/prefs/command_line_pref_store.h
@@ -30,6 +30,11 @@ class CommandLinePrefStore : public ValueMapPrefStore {
     const char* preference_path;
   };
 
+  struct IntegerSwitchToPreferenceMapEntry {
+    const char* switch_name;
+    const char* preference_path;
+  };
+
   // |set_value| indicates what the preference should be set to if the switch
   // is present.
   struct BooleanSwitchToPreferenceMapEntry {
@@ -53,6 +58,7 @@ class CommandLinePrefStore : public ValueMapPrefStore {
   const CommandLine* command_line_;
 
   static const StringSwitchToPreferenceMapEntry string_switch_map_[];
+  static const IntegerSwitchToPreferenceMapEntry integer_switch_map_[];
 
   DISALLOW_COPY_AND_ASSIGN(CommandLinePrefStore);
 };