Linux: add gyp flag for enabling tcmalloc.

build/all.gyp

 # Copyright (c) 2009 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.
 
 {
   'includes': [
     'common.gypi',
   ],
   'targets': [
     {
@@ skipping 34 matching lines @@
         ['javascript_engine=="v8"', {
           'dependencies': [
             '../v8/tools/gyp/v8.gyp:*',
           ],
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../breakpad/breakpad.gyp:*',
             '../sandbox/sandbox.gyp:*',
             '../third_party/harfbuzz/harfbuzz.gyp:*',
+            '../third_party/tcmalloc/tcmalloc.gyp:*',
             '../tools/gtk_clipboard_dump/gtk_clipboard_dump.gyp:*',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:*',
             '../courgette/courgette.gyp:*',
           ],
           'conditions': [
             ['branding=="Chrome"', {
               'dependencies': [
                 '../chrome/installer/installer.gyp:linux_packages',
               ],
             }],
@@ skipping 47 matching lines @@
           'type': 'none',
           'dependencies': [
             'All',
             '../chrome/chrome.gyp:build_app_dmg',
           ],
         },
       ],
     }],
   ],
 }