Reland "Propagate information about how ARC apps are launched"

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index 3326d3c5f29650fbb81436ad97ad915c67ec75ec..ac48f54c3faf9e20d8a68e2ca8bd37bd9d550d58 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -870,7 +870,10 @@ cr.define('options', function() {
         });
 
         $('android-apps-settings-link').addEventListener('click', function(e) {
-            chrome.send('showAndroidAppsSettings');
+            // MouseEvent.detail indicates the current click count (or tap
+            // count, in the case of touch events) in the 'click' event.
+            var activatedFromKeyboard = e.detail == 0;
+            chrome.send('showAndroidAppsSettings', [activatedFromKeyboard]);
         });
       }
     },