Notify launcher page with onTransitionChanged event

chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js

Index: chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
diff --git a/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js b/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
index 9837e850c2a11df1a3c2d5ce2e78877091d8133e..6ac9200002fea524bc03ad8d9a22300482371f78 100644
--- a/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
+++ b/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
@@ -2,4 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+chrome.launcherPage.onTransitionChanged.addListener(function(progress) {
+  if (progress == 0)
+    chrome.test.sendMessage('onPageCollapsed');

[Matt Giuca, 2014/11/07 06:46:29]

Ah I think I understand now... onPageCollapsed and onPageExpanded are not part
of the API; they are test messages.

Can you rename them to progressAt0Percent and progressAt100Percent or something?
That would make it seem less like an actual API message (especially if we later
decide to add onPageCollapsed and onPageExpanded messages to the API; then it
could get really confusing).

[calamity, 2014/11/10 03:38:30]

Done.

+  else if (progress == 1)
+    chrome.test.sendMessage('onPageExpanded');
+})
+
 chrome.test.sendMessage('Launched');