Add metrics for tracking how Chrome handled shortcut launches

chrome/browser/android/webapps/webapp_metrics.cc

-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/android/webapps/webapp_metrics.h"
-
-#include "base/android/jni_string.h"
-#include "base/metrics/user_metrics.h"
-#include "chrome/browser/metrics/rappor/sampling.h"
-#include "jni/WebappMetrics_jni.h"
-#include "url/gurl.h"
-
-namespace webapps {
-
-bool WebappMetrics::Register(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-static void RecordActivityStart(JNIEnv* env, jclass caller,
-                                jstring jurl) {
-  std::string url = base::android::ConvertJavaStringToUTF8(env, jurl);
-  base::RecordAction(base::UserMetricsAction("webapps.LaunchedFromHome"));
-  rappor::SampleDomainAndRegistryFromGURL("webapps.LaunchURL", GURL(url));
-}
-
-};  // namespace webapps
-