metrics: Add leak detector controller in Chrome OS metrics system

build/common.gypi

 # Copyright (c) 2012 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 expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1570 matching lines @@
     'ozone_platform_headless%': 0,
 
     # Experiment: http://crbug.com/426914
     'envoy%': 0,
 
     # Used to set libjpeg_gyp_path. Chrome OS ui/gfx/gfx.gyp uses the IJG path
     # for robust login screen decoding.
     'libjpeg_ijg_gyp_path': '<(DEPTH)/third_party/libjpeg/libjpeg.gyp',
     'libjpeg_turbo_gyp_path': '<(DEPTH)/third_party/libjpeg_turbo/libjpeg.gyp',
 
+    # Enable runtime memory leak detector.
+    'enable_leak_detector%': 0,
+
     'conditions': [
       ['buildtype=="Official"', {
         # Continue to embed build meta data in Official builds, basically the
         # time it was built.
         # TODO(maruel): This decision should be revisited because having an
         # official deterministic build has high value too but MSVC toolset can't
         # generate anything deterministic with WPO enabled AFAIK.
         'dont_embed_build_metadata%': 0,
       }],
       # Enable the Syzygy optimization step for the official builds.
@@ skipping 1474 matching lines @@
           'FULL_SAFE_BROWSING',
           'SAFE_BROWSING_CSD',
           'SAFE_BROWSING_DB_LOCAL',
         ],
       }],
       ['safe_browsing==2 and OS!="ios"', {
         'defines': [
           'SAFE_BROWSING_DB_REMOTE',
         ],
       }],
+      ['enable_leak_detector==1 and chromeos==1', {
+        'defines': ['ENABLE_LEAK_DETECTOR=1'],

[brettw, 2016/02/18 21:14:57]

With the build flag system, this should not be necessary.

[Simon Que, 2016/02/19 02:13:02]

Done.

+      }],
     ],  # conditions for 'target_defaults'
     'target_conditions': [
       ['<(use_libpci)==1', {
         'defines': ['USE_LIBPCI=1'],
       }],
       ['<(use_openssl)==1', {
         'defines': ['USE_OPENSSL=1'],
       }],
       ['<(use_openssl_certs)==1', {
         'defines': ['USE_OPENSSL_CERTS=1'],
@@ skipping 3298 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }