Add metrics for tracking how Chrome handled shortcut launches

chrome/browser/android/metrics/launch_metrics.h

Index: chrome/browser/android/metrics/launch_metrics.h
diff --git a/chrome/browser/android/metrics/launch_metrics.h b/chrome/browser/android/metrics/launch_metrics.h
new file mode 100644
index 0000000000000000000000000000000000000000..996af92cc438f5f76c6062acb95ff39e4a1a28da
--- /dev/null
+++ b/chrome/browser/android/metrics/launch_metrics.h
@@ -0,0 +1,14 @@
+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_METRICS_LAUNCH_METRICS_H_
+#define CHROME_BROWSER_ANDROID_METRICS_LAUNCH_METRICS_H_
+
+#include "base/android/jni_android.h"
+
+namespace metrics {
+bool RegisterLaunchMetrics(JNIEnv* env);
+}  // namespace metrics
+
+#endif  // CHROME_BROWSER_ANDROID_METRICS_LAUNCH_METRICS_H_