Add more Rappor metrics

chrome/browser/metrics/rappor/sampling.h

Index: chrome/browser/metrics/rappor/sampling.h
diff --git a/chrome/browser/metrics/rappor/sampling.h b/chrome/browser/metrics/rappor/sampling.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b5d581cad1c37ea995ec72987b37fd0ffa059b3
--- /dev/null
+++ b/chrome/browser/metrics/rappor/sampling.h
@@ -0,0 +1,26 @@
+// Copyright 2014 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_METRICS_RAPPOR_SAMPLING_H_
+#define CHROME_BROWSER_METRICS_RAPPOR_SAMPLING_H_
+
+#include <string>
+
+class GURL;
+
+namespace rappor {
+
+// Records the domain and registry of a url to a Rappor metric.
+// If the Rappor service is NULL, such as during tests, this call does nothing.
+void SampleDomainAndRegistryFromGURL(const std::string& metric,
+                                     const GURL& gurl);
+
+// Records the domain and registry of a host to a Rappor metric.
+// If the Rappor service is NULL, such as during tests, this call does nothing.
+void SampleDomainAndRegistryFromHost(const std::string& metric,
+                                     const std::string& host);
+
+}  // namespace rappor
+
+#endif  // CHROME_BROWSER_METRICS_RAPPOR_SAMPLING_H_