[Logging] Wire in log levels

Wire in log levels to allow specifying as a query string
parameter; defaults to logging only warnings and above,
for WTD-793.

platform/framework/src/LogLevel.js

@@ -43,7 +43,6 @@ define(
                         log[m] = NOOP;
                     }
                 });
-                return log;
             }
 
             // Default to 'warn' level if unspecified
@@ -67,7 +66,10 @@ define(
                 configure: function (app, $log) {
                     decorate($log);
                     app.config(function ($provide) {
-                        $provide.decorator('$log', decorate);
+                        $provide.decorator('$log', function ($delegate) {
+                            decorate($delegate);
+                            return $delegate;
+                        });
                     });
                 }
             };

platform/framework/src/Main.js

@@ -19,6 +19,7 @@ define(
         '../lib/angular-route.min',
         './Constants',
         './FrameworkInitializer',
+        './LogLevel',
         './load/BundleLoader',
         './resolve/ImplementationLoader',
         './resolve/ExtensionResolver',
@@ -36,6 +37,7 @@ define(
         angularRoute,
         Constants,
         FrameworkInitializer,
+        LogLevel,
         BundleLoader,
         ImplementationLoader,
         ExtensionResolver,
@@ -52,6 +54,12 @@ define(
         // services, which are useful to the framework layer.
         var injector = angular.injector(['ng']);
 
+        // Look up log level from query string
+        function logLevel() {
+            var match = /[?&]log=([a-z]+)/.exec(window.location.search);
+            return match ? match[1] : "";
+        }
+
         // Polyfill Promise, in case browser does not natively provide Promise
         window.Promise = window.Promise || es6promise.Promise;
 
@@ -86,6 +94,11 @@ define(
                     bootstrapper
                 );
 
+            // Apply logging levels; this must be done now, before the
+            // first log statement.
+            new LogLevel(logLevel()).configure(app, $log);
+
+            // Initialize the application
             $log.info("Initializing application.");
             initializer.runApplication(Constants.BUNDLE_LISTING_FILE);
         }