Use tcmalloc on Linux

DEPS

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # We use mirrors of all github repos to guarantee reproducibility and
@@ skipping 16 matching lines @@
   # Only use this temporarily while waiting for a mirror for a new package.
   "github_dartlang": "https://github.com/dart-lang/%s.git",
 
   "gyp_rev": "@6ee91ad8659871916f9aa840d42e1513befdf638",
   "co19_rev": "@d4767b4caea3c5828ad8e053cd051d44a59061af",
 
   # Revisions of GN/Mojo/Flutter related dependencies.
   "base_revision": "@672b04e54b937ec899429a6bd5409c5a6300d151",
   "buildtools_revision": "@565d04e8741429fb1b4f26d102f2c6c3b849edeb",
 
+  "gperftools_revision": "@7822b5b0b9fa7e016e1f6b46ea86f26f4691a457",
+
   # Revisions of /third_party/* dependencies.
   "args_tag": "@0.13.5",
   "async_tag": "@1.11.1",
   "barback-0.13.0_rev": "@34853",
   "barback-0.14.0_rev": "@36398",
   "barback-0.14.1_rev": "@38525",
   "barback_tag" : "@0.15.2+9",
   "bazel_worker_tag": "@0.1.1",
   "boolean_selector_tag" : "@1.0.2",
   "boringssl_rev" : "@8d343b44bbab829d1a28fdef650ca95f7db4412e",
@@ skipping 113 matching lines @@
       Var("chromium_git") + "/chromium/src/third_party/ply.git" +
       Var("ply_rev"),
 
   Var("dart_root") + "/tools/idl_parser":
       Var("chromium_git") + "/chromium/src/tools/idl_parser.git" +
       Var("idl_parser_rev"),
 
   Var("dart_root") + "/third_party/WebCore":
       "https://github.com/dart-lang/webcore.git" + Var("WebCore_rev"),
 
+  Var("dart_root") + "/third_party/tcmalloc/gperftools":
+      "https://github.com/gperftools/gperftools.git" +

[zra, 2016/09/13 15:59:00]

Bill, could we put this in the github mirror? Or is this okay to pull from
github?

+      Var("gperftools_revision"),
+
   Var("dart_root") + "/third_party/pkg/args":
       (Var("github_mirror") % "args") + Var("args_tag"),
   Var("dart_root") + "/third_party/pkg/async":
       (Var("github_mirror") % "async") + Var("async_tag"),
   Var("dart_root") + "/third_party/pkg/barback":
       (Var("github_mirror") % "barback") + Var("barback_tag"),
   Var("dart_root") + "/third_party/pkg/bazel_worker":
       (Var("github_dartlang") % "bazel_worker") + Var("bazel_worker_tag"),
   Var("dart_root") + "/third_party/pkg/boolean_selector":
       (Var("github_dartlang") % "boolean_selector") +
@@ skipping 306 matching lines @@
       "--extract",
       "-s",
       Var('dart_root') + "/third_party/clang.tar.gz.sha1",
     ],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/gyp_dart.py"],
   },
 ]