Add dedicated cros bootstrap_deps.

tools/cros/bootstrap_deps

+# 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.
+
+# 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/tools/cros/":
+    "https://src.chromium.org/chrome/trunk/src/tools/cros/",
+  }
+
+# both gpu_tests and perf will pull in telemetry.
+deps_includes = {
+  "src/content/test/gpu/gpu_tests/bootstrap_deps":
+      "https://src.chromium.org/chrome/trunk/src/content/test/gpu/gpu_tests/bootstrap_deps",
+  "src/tools/perf/bootstrap_deps":
+      "https://src.chromium.org/chrome/trunk/src/tools/perf/bootstrap_deps",
+  }