Android's native_tests.gyp should take WebKit's directory structure into account.

testing/android/native_test.gyp

 # 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.
 
 {
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
           'target_name': 'native_test_apk',
@@ skipping 20 matching lines @@
               'outputs': [
                 # Awkwardly, we build a Debug APK even when gyp is in
                 # Release mode.  I don't think it matters (e.g. we're
                 # probably happy to not codesign) but naming should be
                 # fixed.  The -debug name is an aspect of the android
                 # SDK antfiles (e.g. ${sdk.dir}/tools/ant/build.xml)
                 '<(PRODUCT_DIR)/replaceme_apk/replaceme-debug.apk',
               ],
               'action': [
                 'ant',
+                # TODO: All of these paths are absolute paths right now, while
+                # we really should be using relative paths for anything that is
+                # checked in to the Chromium tree (among which the SDK).
                 '-DPRODUCT_DIR=<(ant_build_out)',
                 '-DANDROID_SDK=<(android_sdk)',
                 '-DANDROID_SDK_ROOT=<(android_sdk_root)',
                 '-DANDROID_SDK_TOOLS=<(android_sdk_tools)',
                 '-DANDROID_SDK_VERSION=<(android_sdk_version)',
                 '-DANDROID_TOOLCHAIN=<(android_toolchain)',
+                '-DCHROMIUM_SRC=<(ant_build_out)/../..',
                 '-buildfile',
                 '<(DEPTH)/testing/android/native_test_apk.xml',
               ]
             }
           ],
         },
         {
           'target_name': 'native_test_native_code',
           'message': 'building native pieces of native test package',
           'type': 'static_library',
@@ skipping 29 matching lines @@
           'direct_dependent_settings': {
             'include_dirs': [
               '<(SHARED_INTERMEDIATE_DIR)',
             ],
           },
         },
       ],
     }]
   ],
 }