Update fieldtrial_util To Handle Combined Fieldtrial Config Format

tools/perf/bootstrap_deps

 # Copyright 2013 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.
 
 # This file specifies dependencies required to bootstrap tools/perf. It is in a
 # minimal version of the format used by other DEPS files that gclient can read,
 # but it should only be used to bootstrap tools/perf *outside* of a normal
 # Chrome checkout.
 
 deps = {
     "src/chrome/test/data/perf/canvas_bench":
         "https://chromium.googlesource.com/chromium/canvas_bench.git",
     "src/chrome/test/data/third_party/spaceport":
         "https://src.chromium.org/chrome/trunk/src/chrome/test/data/third_party/spaceport",
+    "src/tools/json_comment_eater":
+        "https://src.chromium.org/chrome/trunk/src/tools/json_comment_eater",
+    "src/tools/json_to_struct":
+        "https://src.chromium.org/chrome/trunk/src/tools/json_to_struct",
     "src/tools/perf/benchmarks":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/benchmarks",
     "src/tools/perf/core":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/core",
     "src/tools/perf/measurements":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/measurements",
     "src/tools/perf/page_sets":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/page_sets",
     "src/tools/perf/metrics":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/metrics",
     "src/tools/perf/profile_creators":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/profile_creators",
     "src/tools/perf/run_benchmark":
         "https://src.chromium.org/chrome/trunk/src/tools/perf/run_benchmark",
     "src/tools/variations":
         "https://src.chromium.org/chrome/trunk/src/tools/variations",
     "src/testing/variations":
         "https://src.chromium.org/chrome/trunk/src/testing/variations",
     "src/tools/telemetry":
         "https://src.chromium.org/chrome/trunk/src/tools/telemetry",
     "src/third_party/catapult":
         "https://src.chromium.org/chrome/trunk/src/third_party/catapult",
 }