linux: TCMalloc-based C++ heap profiler.

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 158 matching lines @@
     # running the zygote process. If found, and SUID, it will be used to
     # sandbox the zygote process and, thus, all renderer processes.
     'linux_sandbox_path%': '',
 
     # Set this to true to enable SELinux support.
     'selinux%': 0,
 
     # Strip the binary after dumping symbols.
     'linux_strip_binary%': 0,
 
+    # Enable TCMalloc.
+    'linux_use_tcmalloc%': 0,
+
     # Set to select the Title Case versions of strings in GRD files.
     'use_titlecase_in_grd_files%': 0,
 
     # Used to disable Native Client at compile time, for platforms where it
     # isn't supported
     'disable_nacl%': 0,
 
     # Set ARM-v7 compilation flags
     'armv7%': 0,
 
@@ skipping 513 matching lines @@
             # When building with shared libraries, remove the visiblity-hiding
             # flag.
             'cflags!': [ '-fvisibility=hidden' ],
             'conditions': [
               ['target_arch=="x64"', {
                 # Shared libraries need -fPIC on x86-64
                 'cflags': ['-fPIC']
               }]
             ],
           }],
+          ['linux_use_tcmalloc==1', {
+            'defines': ['LINUX_USE_TCMALLOC'],
+          }],
         ],
       },
     }],
     ['OS=="mac"', {
       'target_defaults': {
         'variables': {
           # This should be 'mac_real_dsym%', but there seems to be a bug
           # with % in variables that are intended to be set to different
           # values in different targets, like this one.
           'mac_real_dsym': 0,  # Fake .dSYMs are fine in most cases.
@@ skipping 232 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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