Pass command line arguments through with --load-and-launch-app.

chrome/test/data/extensions/platform_apps/load_and_launch_file/test.js

Index: chrome/test/data/extensions/platform_apps/load_and_launch_file/test.js
diff --git a/chrome/test/data/extensions/platform_apps/launch_file_by_extension/test.js b/chrome/test/data/extensions/platform_apps/load_and_launch_file/test.js
similarity index 95%
copy from chrome/test/data/extensions/platform_apps/launch_file_by_extension/test.js
copy to chrome/test/data/extensions/platform_apps/load_and_launch_file/test.js
index 115fff8f170a3de546d791a0e844904411e1239a..6a327a9b2da269b62929fb708d98a21f08b3c765 100644
--- a/chrome/test/data/extensions/platform_apps/launch_file_by_extension/test.js
+++ b/chrome/test/data/extensions/platform_apps/load_and_launch_file/test.js
@@ -18,7 +18,7 @@ chrome.app.runtime.onLaunched.addListener(function (launchData) {
         reader.onloadend = function(e) {
           chrome.test.assertEq(
               reader.result.indexOf("This is a test. Word."), 0);
-          chrome.test.succeed();
+          chrome.test.sendMessage('Launched');
         };
         reader.onerror = function(e) {
           chrome.test.fail("Error reading file contents.");