Add support for field trials to event log visualizer.

webrtc/tools/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//third_party/protobuf/proto_library.gni")
 import("../build/webrtc.gni")
@@ skipping 190 matching lines @@
       ]
 
       if (!build_with_chromium && is_clang) {
         # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
         suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
       }
 
       defines = [ "ENABLE_RTC_EVENT_LOG" ]
       deps = [
         ":event_log_visualizer_utils",
+        "../test:field_trial",
         "//third_party/gflags",
       ]
     }
   }
 
   rtc_executable("activity_metric") {
     testonly = true
     sources = [
       "agc/activity_metric.cc",
     ]
@@ skipping 69 matching lines @@
       ]
       outputs = [
         "$root_build_dir/{{source_file_part}}",
       ]
       deps = [
         "../logging:rtc_event_log_proto",
       ]
     }
   }
 }