Bug 1094362 - Completely disable update prefs for reftest. r=vingtetun, r=jgriffin

When running reftests on Mulet, we do not want that forced update
checking gets triggered. We can block this by setting the following
prefs:
 - app.update.enabled to false
 - app.update.url.override and app.update.url to empty string
We also disable tiles-related pinging and downloading by setting empy
values for:
 - browser.newtabpage.directory.source
 - browser.newtabpage.directory.ping
Gaia also does force check app updates at some point, so we introduce a
new pref, webapps.update.enabled, that we can use to make sure webapps
update won't be triggered.

b2g/app/b2g.js

@@ -610,6 +610,9 @@ pref("app.update.log", true);
 pref("shutdown.watchdog.timeoutSecs", -1);
 #endif
 
+// Allow webapps update checking
+pref("webapps.update.enabled", true);
+
 // Check daily for apps updates.
 pref("webapps.update.interval", 86400);
 

b2g/components/WebappsUpdater.jsm

@@ -60,6 +60,15 @@ this.WebappsUpdater = {
       return;
     }
 
+    let allowUpdate = true;
+    try {
+      allowUpdate = Services.prefs.getBoolPref("webapps.update.enabled");
+    } catch (ex) { }
+
+    if (!allowUpdate) {
+      return;
+    }
+
     this._checkingApps = true;
 
     let self = this;

layout/tools/reftest/b2g_desktop.py

@@ -118,6 +118,15 @@ class B2GDesktopReftest(RefTest):
                     "app://test-container.gaiamobile.org/index.html"
             prefs["b2g.system_manifest_url"] = \
                     "app://test-container.gaiamobile.org/manifest.webapp"
+        # Make sure we disable system updates
+        prefs["app.update.enabled"] = False
+        prefs["app.update.url"] = ""
+        prefs["app.update.url.override"] = ""
+        # Disable webapp updates
+        prefs["webapps.update.enabled"] = False
+        # Disable tiles also
+        prefs["browser.newtabpage.directory.source"] = ""
+        prefs["browser.newtabpage.directory.ping"] = ""
         prefs["dom.ipc.tabs.disabled"] = False
         prefs["dom.mozBrowserFramesEnabled"] = True
         prefs["font.size.inflation.emPerLine"] = 0

layout/tools/reftest/runreftestb2g.py

@@ -443,6 +443,15 @@ class B2GRemoteReftest(RefTest):
         # Set a future policy version to avoid the telemetry prompt.
         prefs["toolkit.telemetry.prompted"] = 999
         prefs["toolkit.telemetry.notifiedOptOut"] = 999
+        # Make sure we disable system updates
+        prefs["app.update.enabled"] = False
+        prefs["app.update.url"] = ""
+        prefs["app.update.url.override"] = ""
+        # Disable webapp updates
+        prefs["webapps.update.enabled"] = False
+        # Disable tiles also
+        prefs["browser.newtabpage.directory.source"] = ""
+        prefs["browser.newtabpage.directory.ping"] = ""
 
         if options.oop:
             prefs['browser.tabs.remote.autostart'] = True