Pipe a bit down to the InstantExtended new tab page javascript API for whether or not the app launc…

chrome/browser/ui/search/instant_page.cc

Index: chrome/browser/ui/search/instant_page.cc
diff --git a/chrome/browser/ui/search/instant_page.cc b/chrome/browser/ui/search/instant_page.cc
index 3949861bf55d9fd928e023ae4f43d1a61457ba1e..a35d44fabfd12e9b26798bf12c2d683cb35f2479 100644
--- a/chrome/browser/ui/search/instant_page.cc
+++ b/chrome/browser/ui/search/instant_page.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/search/instant_page.h"
 
+#include "apps/app_launcher.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/ui/search/instant_ipc_sender.h"
@@ -57,6 +58,10 @@ void InstantPage::InitializeFonts() {
                                omnibox_font.GetFontSize());
 }
 
+void InstantPage::InitializePromos() {
+  sender()->SetPromoInformation(apps::IsAppLauncherEnabled());

[Jered, 2013/06/25 22:12:23]

This seems to be set based on a pref. But it looks like that pref is obsolete or
something. Do you want to deal with updating it when that pref changes?

[David Black, 2013/06/25 22:40:42]

Eh?  Where are you seeing that it's obsolete?  IsAppLauncherEnabled checks the
pref prefs::kAppLauncherHasBeenEnabled, which is set here:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ui/....

kAppLauncherIsEnabled seems to be obsolete - perhaps that's what you were
thinking of?

+}
+
 InstantPage::InstantPage(Delegate* delegate, const std::string& instant_url,
                          bool is_incognito)
     : delegate_(delegate),