Add support for launching experimental Keep.

chrome/browser/chromeos/note_taking_app_utils.cc

Index: chrome/browser/chromeos/note_taking_app_utils.cc
diff --git a/chrome/browser/chromeos/note_taking_app_utils.cc b/chrome/browser/chromeos/note_taking_app_utils.cc
index 7ecffaff10897c3f4e415876e1fd6fe9050c18a8..df76f3bdb97eaed337bd1861abcd41cd94a2decf 100644
--- a/chrome/browser/chromeos/note_taking_app_utils.cc
+++ b/chrome/browser/chromeos/note_taking_app_utils.cc
@@ -27,6 +27,8 @@ namespace {
 
 // TODO(derat): Add more IDs.
 const char* const kExtensionIds[] = {
+    // TODO(jdufault): Remove testing version after m54. See crbug.com/640828.
+    "ogfjaccbdfhecploibfbhighmebiffla",  // Testing Keep app
     "hmjkmjkepdijhoojdojkdfohbdgmmhki",  // Google Keep app (Web Store)
 };