fix(benchpress): fix benchpress overreporting in chrome45

closes angular#4011

Closes angular#4101

Author: goderbauer

modules/benchpress/src/webdriver/chrome_driver_extension.ts

@@ -183,7 +183,8 @@ export class ChromeDriverExtension extends WebDriverExtension {
       return normalizeEvent(event, {'name': 'gc', 'args': normArgs});
     } else if (this._isEvent(categories, name, ['devtools.timeline', 'v8'], 'FunctionCall') &&
                (isBlank(args) || isBlank(args['data']) ||
-                !StringWrapper.equals(args['data']['scriptName'], 'InjectedScript'))) {
+                (!StringWrapper.equals(args['data']['scriptName'], 'InjectedScript') &&
+                 !StringWrapper.equals(args['data']['scriptName'], '')))) {
       return normalizeEvent(event, {'name': 'script'});
     } else if (this._isEvent(categories, name, ['devtools.timeline', 'blink'],
                              'UpdateLayoutTree')) {

modules/benchpress/test/webdriver/chrome_driver_extension_spec.ts

@@ -342,6 +342,17 @@ export function main() {
                });
          }));
 
+      it('should ignore FunctionCalls with empty scriptName',
+         inject([AsyncTestCompleter], (async) => {
+           createExtension(
+               [chromeTimelineV8Events.start('FunctionCall', 0, {'data': {'scriptName': ''}})])
+               .readPerfLog()
+               .then((events) => {
+                 expect(events).toEqual([]);
+                 async.done();
+               });
+         }));
+
 
     });