Add parser for new cpu freq file

chrome/browser/chromeos/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 1699 matching lines @@
     "policy/network_configuration_updater_unittest.cc",
     "policy/recommendation_restorer_unittest.cc",
     "policy/remote_commands/device_command_screenshot_job_unittest.cc",
     "policy/remote_commands/device_command_set_volume_job_unittest.cc",
     "policy/server_backed_state_keys_broker_unittest.cc",
     "policy/status_uploader_unittest.cc",
     "policy/system_log_uploader_unittest.cc",
     "policy/upload_job_unittest.cc",
     "policy/user_cloud_policy_manager_chromeos_unittest.cc",
     "policy/user_cloud_policy_store_chromeos_unittest.cc",
+    "power/cpu_data_collector_unittest.cc",
     "power/extension_event_observer_unittest.cc",
     "power/power_data_collector_unittest.cc",
     "power/power_prefs_unittest.cc",
     "power/renderer_freezer_unittest.cc",
     "preferences_unittest.cc",
     "printer_detector/printer_detector_unittest.cc",
     "printing/printers_manager_unittest.cc",
     "printing/specifics_translation_unittest.cc",
     "profiles/profile_list_chromeos_unittest.cc",
     "proxy_config_service_impl_unittest.cc",
@@ skipping 106 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }