Fix ninja build for android.

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 857 matching lines @@
           'android_ndk_sysroot': '<(android_ndk_root)/platforms/android-9/arch-<(target_arch)',
           'android_build_type%': '<(android_build_type)',
           'android_app_abi%': '<(android_app_abi)',
         },
         'android_ndk_root%': '<(android_ndk_root)',
         'android_ndk_sysroot': '<(android_ndk_sysroot)',
         'android_ndk_include': '<(android_ndk_sysroot)/usr/include',
         'android_ndk_lib': '<(android_ndk_sysroot)/usr/lib',
         'android_app_abi%': '<(android_app_abi)',
 
+        # Provides an absolute path to PRODUCT_DIR (e.g. out/Release). Used
+        # to specify the output directory for Ant in the Android build.
+        'ant_build_out': '`cd <(PRODUCT_DIR) && pwd -P`',
+
         # Uses Android's crash report system
         'linux_breakpad%': 0,
 
         # Always uses openssl.
         'use_openssl%': 1,
 
         'proprietary_codecs%': '<(proprietary_codecs)',
         'enable_task_manager%': 0,
         'safe_browsing%': 0,
         'configuration_policy%': 0,
@@ skipping 2230 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',
   },
 }