Implement app launch changes for app runtime extension proposal.

apps/launcher.h

Index: apps/launcher.h
diff --git a/apps/launcher.h b/apps/launcher.h
index fa6ea1582d27dee47fee5d9b51d3a946f83c2931..66211214955db01454d8002499f8b641a2e1e068 100644
--- a/apps/launcher.h
+++ b/apps/launcher.h
@@ -41,6 +41,14 @@ void LaunchPlatformAppWithPath(Profile* profile,
                                const extensions::Extension* extension,
                                const base::FilePath& file_path);
 
+// Launches the platform app |extension| with the specific |action_data|.
+// |file_path| is an optional argument and if present contains the file that the
+// app should open w.r.t. the given action.
+void LaunchPlatformAppWithAction(Profile* profile,
+                                 const extensions::Extension* extension,

[Devlin, 2016/08/11 20:51:20]

let's use |app| instead of |extension| (I know the other places call it
extension, but that's just awkward).

[jdufault, 2016/08/12 18:56:55]

Done.

+                                 const extensions::ActionData& action_data,
+                                 const base::FilePath& file_path);
+
 // Launches the platform app |extension|. |source| tells us how the app is
 // launched.
 void LaunchPlatformApp(Profile* profile,