refactor(bench press): rename metrics and adapt them to the features of the browser

* Rename metrics, add `Time` suffix to all so that they are
  more consistent
* iOS does not give us `gc` metrics, so they should not be reported
* Rename `scriptMicroAvg` into `microScriptTimeAvg`
* Rename previous `script` metric into `pureScriptTime` metric,
  and keep `scriptTime` metric as the overall time, so that we still
  have a shared metric across devices independent of the supported
  browser features
* `microScriptTimeAvg` is now based on overall `scriptTime`, including
  gc and render time.
* Move more shared DI tokens into `common_options` (previously
  `sample_options`).

Closes #930

modules/benchpress/test/sampler_spec.js

@@ -50,15 +50,17 @@ export function main() {
       if (isBlank(driverExtension)) {
         driverExtension = new MockDriverExtension([]);
       }
-      var bindings = ListWrapper.concat(Sampler.BINDINGS, [
+      var bindings = [
+        Options.DEFAULT_BINDINGS,
+        Sampler.BINDINGS,
         bind(Metric).toValue(metric),
         bind(Reporter).toValue(reporter),
         bind(WebDriverAdapter).toValue(driver),
         bind(WebDriverExtension).toValue(driverExtension),
         bind(Options.EXECUTE).toValue(execute),
         bind(Validator).toValue(validator),
-        bind(Sampler.TIME).toValue( () => DateWrapper.fromMillis(time++) )
-      ]);
+        bind(Options.NOW).toValue( () => DateWrapper.fromMillis(time++) )
+      ];
       if (isPresent(prepare)) {
         ListWrapper.push(bindings, bind(Options.PREPARE).toValue(prepare));
       }