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

This broke the WebKit Chromium Android bot.

BUG=142322

Review URL: https://chromiumcodereview.appspot.com/10829291

git-svn-id: http://src.chromium.org/svn/trunk/src/build@151257 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

apk_test.gypi

@@ -61,6 +61,8 @@
               '-DANDROID_SDK_VERSION=<(android_sdk_version)',
               '--ant-args',
               '-DANDROID_TOOLCHAIN=<(android_toolchain)',
+              '--ant-args',
+              '-DCHROMIUM_SRC=<(ant_build_out)/../..',
               '--ant-compile'
             ],
           }],