Add an IPC method for Blink to call RapporService::RecordSample()

components/rappor/BUILD.gn

 # 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.
 
 # GYP version: components/rappor.gypi:rappor
 static_library("rappor") {
   sources = [
     "bloom_filter.cc",
     "bloom_filter.h",
     "byte_vector_utils.cc",
     "byte_vector_utils.h",
     "log_uploader.cc",
     "log_uploader.h",
     "log_uploader_interface.h",
+    "rappor_message_filter.cc",
+    "rappor_message_filter.h",
     "rappor_metric.cc",
     "rappor_metric.h",
     "rappor_parameters.cc",
     "rappor_parameters.h",
     "rappor_pref_names.cc",
     "rappor_pref_names.h",
     "rappor_prefs.cc",
     "rappor_prefs.h",
     "rappor_service.cc",
     "rappor_service.h",
@@ skipping 40 matching lines @@
     "rappor_utils_unittest.cc",
   ]
 
   deps = [
     ":rappor",
     "//base/test:test_support",
     "//components/rappor/proto",
     "//testing/gtest",
   ]
 }