app_list: Drive app integration.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index f07574cc18753dda569dfc1f438d0f566a638b69..5793534f2593e78d89fa27e841ba129a319bc839 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2469,6 +2469,12 @@ const char kAppLauncherShortcutVersion[] = "apps.app_launcher.shortcut_version";
 
 // A boolean identifying if we should show the app launcher promo or not.
 const char kShowAppLauncherPromo[] = "app_launcher.show_promo";
+
+// A dictionary that tracks the Drive app to Chrome app mapping. The key is
+// a Drive app id and the value is the corresponding Chrome app id. The pref
+// is unsynable and used to track local mappings only.
+const char kAppLauncherDriveAppMapping[] =
+    "apps.app_launcher.drive_app_mapping";
 #endif
 
 // If set, the user requested to launch the app with this extension id while