Bug 725215 - Add magic shortcut to enable debugging features [r=cjones]

b2g/chrome/content/shell.js

@@ -66,6 +66,8 @@ function addPermissions(urls) {
 var shell = {
   // FIXME/bug 678695: this should be a system setting
   preferredScreenBrightness: 1.0,
+  
+  isDebug: false,
 
   get contentBrowser() {
     delete this.contentBrowser;
@@ -145,6 +147,7 @@ var shell = {
     window.controllers.removeController(this);
     window.removeEventListener('keypress', this);
     window.removeEventListener('MozApplicationManifest', this);
+    window.removeEventListener('AppCommand', this);
   },
 
   supportsCommand: function shell_supportsCommand(cmd) {
@@ -172,6 +175,18 @@ var shell = {
     }
   },
 
+  toggleDebug: function shell_toggleDebug() {
+    this.isDebug = !this.isDebug;
+
+    if (this.isDebug) {
+      Services.prefs.setBoolPref("layers.acceleration.draw-fps", true);
+      Services.prefs.setBoolPref("nglayout.debug.paint_flashing", true);
+    } else {
+      Services.prefs.setBoolPref("layers.acceleration.draw-fps", false);
+      Services.prefs.setBoolPref("nglayout.debug.paint_flashing", false);
+    }
+  },
+
   handleEvent: function shell_handleEvent(evt) {
     switch (evt.type) {
       case 'keypress':
@@ -199,6 +214,9 @@ var shell = {
           case 'Menu':
             this.sendEvent(content, 'menu');
             break;
+          case 'Search':
+            this.toggleDebug();
+            break;
         }
         break;
       case 'load':