Bug 500710: double clicking in the url bar should select all, r=vingtetun

mobile/app/mobile.js

@@ -217,7 +217,7 @@ pref("browser.xul.error_pages.enabled", true);
 // various and sundry awesomebar prefs (should remove/re-evaluate
 // these once bug 447900 is fixed)
 pref("browser.urlbar.clickSelectsAll", true);
-pref("browser.urlbar.doubleClickSelectsAll", false);
+pref("browser.urlbar.doubleClickSelectsAll", true);
 pref("browser.urlbar.autoFill", false);
 pref("browser.urlbar.matchOnlyTyped", false);
 pref("browser.urlbar.matchBehavior", 1);

mobile/chrome/content/browser-ui.js

@@ -323,7 +323,9 @@ var BrowserUI = {
     this._favicon.addEventListener("error", this, false);
     this._autocompleteNavbuttons = document.getElementById("autocomplete_navbuttons");
 
-    document.getElementById("urlbar-editarea").addEventListener("click", this, false);
+    let urlbarEditArea = document.getElementById("urlbar-editarea");
+    urlbarEditArea.addEventListener("click", this, false);
+    urlbarEditArea.addEventListener("mousedown", this, false);
 
     document.getElementById("tabs").addEventListener("TabSelect", this, true);
 
@@ -576,6 +578,14 @@ var BrowserUI = {
           this._editToolbar(false);
         }
         break;
+      case "mousedown":
+        if (aEvent.detail == 2 &&
+            aEvent.button == 0 &&
+            gPrefService.getBoolPref("browser.urlbar.doubleClickSelectsAll")) {
+          this._edit.editor.selectAll();
+          aEvent.preventDefault();
+        }
+        break;
       // Favicon events
       case "error":
         this._favicon.src = "chrome://browser/skin/images/default-favicon.png";