Bug 1470333: Part 2 - Avoid creating ConsoleAPI instances when debug logging is not enabled. r=MattN

MozReview-Commit-ID: Edck1SgCcDA

--HG--
extra : source : dbea1942a32f8bd565f3d500d79fa19db8916fcc
extra : absorb_source : e50ef26aa346f7890d135637411b8988925b9700

browser/base/content/test/performance/browser_startup_content.js

@@ -42,7 +42,6 @@ const whitelist = {
     "resource://gre/modules/XPCOMUtils.jsm",
 
     // Logging related
-    "resource://gre/modules/Console.jsm", // bug 1470333
     "resource://gre/modules/Log.jsm",
 
     // Session store

toolkit/components/passwordmgr/LoginHelper.jsm

@@ -40,13 +40,19 @@ var LoginHelper = {
       return this.debug ? "debug" : "warn";
     };
 
-    // Create a new instance of the ConsoleAPI so we can control the maxLogLevel with a pref.
-    let ConsoleAPI = ChromeUtils.import("resource://gre/modules/Console.jsm", {}).ConsoleAPI;
-    let consoleOptions = {
-      maxLogLevel: getMaxLogLevel(),
-      prefix: aLogPrefix,
-    };
-    let logger = new ConsoleAPI(consoleOptions);
+    let logger;
+    function getConsole() {
+      if (!logger) {
+        // Create a new instance of the ConsoleAPI so we can control the maxLogLevel with a pref.
+        let ConsoleAPI = ChromeUtils.import("resource://gre/modules/Console.jsm", {}).ConsoleAPI;
+        let consoleOptions = {
+          maxLogLevel: getMaxLogLevel(),
+          prefix: aLogPrefix,
+        };
+        logger = new ConsoleAPI(consoleOptions);
+      }
+      return logger;
+    }
 
     // Watch for pref changes and update this.debug and the maxLogLevel for created loggers
     Services.prefs.addObserver("signon.", () => {
@@ -54,10 +60,31 @@ var LoginHelper = {
       this.formlessCaptureEnabled = Services.prefs.getBoolPref("signon.formlessCapture.enabled");
       this.schemeUpgrades = Services.prefs.getBoolPref("signon.schemeUpgrades");
       this.insecureAutofill = Services.prefs.getBoolPref("signon.autofillForms.http");
-      logger.maxLogLevel = getMaxLogLevel();
+      if (logger) {
+        logger.maxLogLevel = getMaxLogLevel();
+      }
     });
 
-    return logger;
+    return {
+      log: (...args) => {
+        if (this.debug) {
+          getConsole().log(...args);
+        }
+      },
+      error: (...args) => {
+        getConsole().error(...args);
+      },
+      debug: (...args) => {
+        if (this.debug) {
+          getConsole().debug(...args);
+        }
+      },
+      warn: (...args) => {
+        if (this.debug) {
+          getConsole().warn(...args);
+        }
+      },
+    };
   },
 
   /**