Always drop a tombstone

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 2509 matching lines @@
       'target_defaults': {
         'ldflags': [
           '-Wl,--no-keep-memory',
         ],
       },
     }],
     # Android-specific options; note that most are set above with Linux.
     ['OS=="android"', {
       'variables': {
         'target_arch%': 'arm',  # target_arch in android terms.
+        # This is the id for the archived chrome symbols. Each build that
+        # archives symbols is assigned an id which is then added to GYP_DEFINES.
+        # This is written to the device log on crashes just prior to dropping a
+        # tombstone. Tools can determine the location of the archived symbols
+        # from the id.
+        'chrome_symbols_id%': '',
         'conditions': [
           # Android uses x86 instead of ia32 for their target_arch designation.
           ['target_arch=="ia32"', {
             'target_arch%': 'x86',
           }],
           # Use shared stlport library when system one used.
           # Figure this out early since it needs symbols from libgcc.a, so it
           # has to be before that in the set of libraries.
           ['use_system_stlport==1', {
             'android_stlport_library': 'stlport',
@@ skipping 64 matching lines @@
               '-fno-short-enums',
               '-finline-limit=64',
               '-Wa,--noexecstack',
               '<@(release_extra_cflags)',
             ],
             'defines': [
               'ANDROID',
               '__GNU_SOURCE=1',  # Necessary for clone()
               'USE_STLPORT=1',
               '_STLP_USE_PTR_SPECIALIZATIONS=1',
+              'CHROME_SYMBOLS_ID="<(chrome_symbols_id)"',
             ],
             'ldflags!': [
               '-pthread',  # Not supported by Android toolchain.
             ],
             'ldflags': [
               '-nostdlib',
               '-Wl,--no-undefined',
               # Don't export symbols from statically linked libraries.
               '-Wl,--exclude-libs=ALL',
             ],
@@ skipping 792 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',
   },
 }