Gallery.app: Add empty place holders for new separated Gallery app.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index c9264bf15e8b11e6862c5e5bb0e953040a138e03..5d1ad50983c3ebe3089e1f9718afd9906d709798 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -103,6 +103,10 @@ const char kEnterpriseEnrollmentSkipRobotAuth[] =
 const char kFileManagerEnableNewAudioPlayer[] =
     "file-manager-enable-new-audio-player";
 
+// Enables the new gallery in the Files.app.
+const char kFileManagerEnableNewGallery[] =
+    "file-manager-enable-new-gallery";
+
 // Passed to Chrome the first time that it's run after the system boots.
 // Not passed on restart after sign out.
 const char kFirstExecAfterBoot[]            = "first-exec-after-boot";