Add AppWindow.setVisibleOnAllWorkspaces.

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

Index: chrome/test/data/extensions/platform_apps/window_api/test.js
diff --git a/chrome/test/data/extensions/platform_apps/window_api/test.js b/chrome/test/data/extensions/platform_apps/window_api/test.js
index ebcc4447339240d001de0cdd34ad7bbbda55528d..14396a3dfbfbd83855a38b401e53390c9da3c709 100644
--- a/chrome/test/data/extensions/platform_apps/window_api/test.js
+++ b/chrome/test/data/extensions/platform_apps/window_api/test.js
@@ -1352,6 +1352,21 @@ function testFrameColors() {
   ]);
 }
 
+function testVisibleOnAllWorkspaces() {
+  chrome.test.runTests([
+    function setAndUnsetVisibleOnAllWorkspaces() {
+      chrome.app.window.create('test.html', {
+        visibleOnAllWorkspaces: true
+      }, callbackPass(function(win) {
+        win.setVisibleOnAllWorkspaces(false);
+        win.setVisibleOnAllWorkspaces(true);
+        chrome.test.sendMessage(
+            'WaitForRoundTrip', callbackPass(function(reply) {}));
+      }));
+    },
+  ]);
+}
+
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.test.sendMessage('Launched', function(reply) {
     window[reply]();