Make "source" a required argument of AppLaunchParams and fill in the argument in all call points.

chrome/browser/ui/extensions/app_launch_params.h

Index: chrome/browser/ui/extensions/app_launch_params.h
diff --git a/chrome/browser/ui/extensions/app_launch_params.h b/chrome/browser/ui/extensions/app_launch_params.h
index a65ed757d8d3dbb086ed52eb53fbf242ef315fb7..5b66cecbff6798832010e09b0e19007e18f1bdfe 100644
--- a/chrome/browser/ui/extensions/app_launch_params.h
+++ b/chrome/browser/ui/extensions/app_launch_params.h
@@ -26,13 +26,15 @@ struct AppLaunchParams {
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
                   extensions::LaunchContainer container,
-                  WindowOpenDisposition disposition);
+                  WindowOpenDisposition disposition,
+                  extensions::AppLaunchSource source);
 
   // Helper to create AppLaunchParams using extensions::GetLaunchContainer with
   // LAUNCH_TYPE_REGULAR to check for a user-configured container.
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
-                  WindowOpenDisposition disposition);
+                  WindowOpenDisposition disposition,
+                  extensions::AppLaunchSource source);
 
   // Helper to create AppLaunchParams using event flags that allows user to
   // override the user-configured container using modifier keys, falling back to
@@ -40,8 +42,9 @@ struct AppLaunchParams {
   // indicates the desktop upon which to launch (Ash or Native).
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
-                  int event_flags,
-                  chrome::HostDesktopType desktop_type);
+                  WindowOpenDisposition disposition,
+                  chrome::HostDesktopType desktop_type,
+                  extensions::AppLaunchSource source);
 
   ~AppLaunchParams();