Add API for new Cronet metrics

components/cronet/android/BUILD.gn

 # 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")
 import("//testing/test.gni")
@@ skipping 303 matching lines @@
   run_findbugs_override = true
 }
 
 android_library("cronet_java") {
   java_files = [
     "java/src/org/chromium/net/impl/ChromiumUrlRequest.java",
     "java/src/org/chromium/net/impl/ChromiumUrlRequestContext.java",
     "java/src/org/chromium/net/impl/ChromiumUrlRequestFactory.java",
     "java/src/org/chromium/net/impl/CronetBidirectionalStream.java",
     "java/src/org/chromium/net/impl/CronetLibraryLoader.java",
+    "java/src/org/chromium/net/impl/CronetMetrics.java",
     "java/src/org/chromium/net/impl/CronetUploadDataStream.java",
     "java/src/org/chromium/net/impl/CronetUrlRequest.java",
     "java/src/org/chromium/net/impl/CronetUrlRequestContext.java",
     "java/src/org/chromium/net/urlconnection/CronetBufferedOutputStream.java",
     "java/src/org/chromium/net/urlconnection/CronetChunkedOutputStream.java",
     "java/src/org/chromium/net/urlconnection/CronetFixedModeOutputStream.java",
     "java/src/org/chromium/net/urlconnection/CronetHttpURLConnection.java",
     "java/src/org/chromium/net/urlconnection/CronetHttpURLStreamHandler.java",
     "java/src/org/chromium/net/urlconnection/CronetInputStream.java",
     "java/src/org/chromium/net/urlconnection/CronetOutputStream.java",
@@ skipping 586 matching lines @@
     ":cronet_package_copy_native_lib",
     ":cronet_package_copy_native_lib_unstripped",
     ":generate_javadoc",
     ":generate_licenses",
     ":jar_cronet_api_source",
     ":jar_cronet_other_source",
     ":jar_cronet_sample_source",
     ":repackage_extracted_jars",
   ]
 }