Allow platform apps to add themselves to the Action Box.

chrome/common/extensions/extension_manifest_constants.cc

Index: chrome/common/extensions/extension_manifest_constants.cc
diff --git a/chrome/common/extensions/extension_manifest_constants.cc b/chrome/common/extensions/extension_manifest_constants.cc
index 4b6971dfd5948fdd82fcf787687d1a445fa8af19..f2bae23f67346d1d48473f41ad25cef5902b8d2f 100644
--- a/chrome/common/extensions/extension_manifest_constants.cc
+++ b/chrome/common/extensions/extension_manifest_constants.cc
@@ -92,6 +92,7 @@ const char kPageActionId[] = "id";
 const char kPageActionPopup[] = "popup";
 const char kPageActionPopupPath[] = "path";
 const char kPageActions[] = "page_actions";
+const char kPageLauncher[] = "page_launcher";
 const char kPermissions[] = "permissions";
 const char kPlatformAppBackground[] = "app.background";
 const char kPlatformAppBackgroundPage[] = "app.background.page";
@@ -421,6 +422,8 @@ const char kInvalidPageActionsListSize[] =
     "Invalid value for 'page_actions'. There can be at most one page action.";
 const char kInvalidPageActionTypeValue[] =
     "Invalid value for 'page_actions[*].type', expected 'tab' or 'permanent'.";
+const char kInvalidPageLauncher[] =
+    "Invalid value for 'page_launcher'.";
 const char kInvalidPermission[] =
     "Invalid value for 'permissions[*]'.";
 const char kInvalidPermissions[] =