Add a rappor metric for getting package names for custom tabs clients

chrome/browser/android/rappor/rappor_service_bridge.cc

 // Copyright 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/rappor/rappor_service_bridge.h"
 
 #include "base/android/jni_string.h"
 #include "chrome/browser/browser_process.h"
 #include "components/rappor/rappor_utils.h"
 #include "jni/RapporServiceBridge_jni.h"
 #include "url/gurl.h"
 
 namespace rappor {
 
 void SampleDomainAndRegistryFromURL(JNIEnv* env,
                                     const JavaParamRef<jclass>& caller,
                                     const JavaParamRef<jstring>& j_metric,
                                     const JavaParamRef<jstring>& j_url) {
   // TODO(knn): UMA metrics hash the string to prevent frequent re-encoding,
   // perhaps we should do that as well.
   std::string metric(base::android::ConvertJavaStringToUTF8(env, j_metric));
   GURL gurl(base::android::ConvertJavaStringToUTF8(env, j_url));
   rappor::SampleDomainAndRegistryFromGURL(g_browser_process->rappor_service(),
                                           metric, gurl);
 }
 
+void SampleString(JNIEnv* env,
+                  const JavaParamRef<jclass>& caller,
+                  const JavaParamRef<jstring>& j_metric,
+                  const JavaParamRef<jstring>& j_value) {
+  std::string metric(base::android::ConvertJavaStringToUTF8(env, j_metric));
+  std::string value(base::android::ConvertJavaStringToUTF8(env, j_value));
+  rappor::SampleString(g_browser_process->rappor_service(),
+                       metric, rappor::UMA_RAPPOR_TYPE, value);
+}
+
 bool RegisterRapporServiceBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace rappor