Ensure there are always nice icons for bookmark apps.

extensions/common/manifest_constants.cc

Index: extensions/common/manifest_constants.cc
diff --git a/extensions/common/manifest_constants.cc b/extensions/common/manifest_constants.cc
index ce02109d7480d589c765ab0413f4b369888a75f5..4980bc9616f2800173a56901613ac300c050e201 100644
--- a/extensions/common/manifest_constants.cc
+++ b/extensions/common/manifest_constants.cc
@@ -12,6 +12,7 @@ const char kAboutPage[] = "about_page";
 const char kAllFrames[] = "all_frames";
 const char kAltKey[] = "altKey";
 const char kApp[] = "app";
+const char kAppIconColor[] = "app.icon_color";
 const char kAutomation[] = "automation";
 const char kBackgroundAllowJsAccess[] = "background.allow_js_access";
 const char kBackgroundPage[] = "background.page";