Don't show the apps page on the NTP if the app launcher is installed.

chrome/browser/resources/ntp4/new_tab.js

Index: chrome/browser/resources/ntp4/new_tab.js
diff --git a/chrome/browser/resources/ntp4/new_tab.js b/chrome/browser/resources/ntp4/new_tab.js
index 0fa946c3c41bec271769be9ca83af09b10e5b438..2a6c63bc4ed55e958f4d526b4b40df80bfe9f47f 100644
--- a/chrome/browser/resources/ntp4/new_tab.js
+++ b/chrome/browser/resources/ntp4/new_tab.js
@@ -110,6 +110,14 @@ cr.define('ntp', function() {
     }
   };
 
+  function gotShouldShowApps(shouldShowApps) {
+    if (shouldShowApps != loadTimeData.getBoolean('showApps')) {
+      // TODO(jeremya): update the UI in-place instead of reloading.
+      window.location.reload();
+      return;
+    }
+  }
+
   /**
    * Invoked at startup once the DOM is available to initialize the app.
    */
@@ -628,6 +636,7 @@ cr.define('ntp', function() {
     getAppsPageIndex: getAppsPageIndex,
     getCardSlider: getCardSlider,
     onLoad: onLoad,
+    gotShouldShowApps: gotShouldShowApps,
     leaveRearrangeMode: leaveRearrangeMode,
     logTimeToClick: logTimeToClick,
     NtpFollowAction: NtpFollowAction,
@@ -645,6 +654,8 @@ cr.define('ntp', function() {
   };
 });
 
+// This will end up calling ntp.gotShouldShowApps.
+chrome.send('getShouldShowApps');

[Evan Stade, 2013/01/23 23:34:24]

this should probably be a part of onLoad

[jeremya, 2013/01/24 02:40:04]

Why's that?

[Evan Stade, 2013/01/24 18:40:16]

well, my thinking was that if gotShouldShowApps were called before onLoad, then
you'd have a hard time updating the DOM (your TODO). But I suppose in that case
you could just build the DOM correctly in the first place instead of needing to
update it.

[jeremya, 2013/01/25 00:06:19]

Right, that makes sense -- if we get the gotShouldShowApps message before
onLoad, we could just update the load time data and carry on as normal, without
having to reload. I'll save that for a follow-up patch though.

 document.addEventListener('DOMContentLoaded', ntp.onLoad);
 
 var toCssPx = cr.ui.toCssPx;