android build fail

@haru398801 is already working on this.

Since Jun 19, 2018.

The chromium build succeeds, but the Android build fails.
It seems like there are no related files for google_play_services.
The detailed build logs are shown below.
Environment: Ubuntu 14.04.5 LTS

```
hhd2002@hhdubuntu:~/stellite$ ./tools/build.py --target-platform=android --target stellite_http_client build
chromium is already exists: /home/hhd2002/stellite/third_party/chromium_android
check chromium ...
check chromium tag ...
copy .gclient ...
copy modified_files ...
copy chromium/src/.gn ...
copy node_binder files ...
Running: ln -s /home/hhd2002/stellite/node_binder
copy stellite files...
Running: ln -s /home/hhd2002/stellite/stellite
copya stellite build fakefiles ...
Running: ln -s /home/hhd2002/stellite/build_android/src/tools/vim/chromium.ycm_extra_conf.py /home/hhd2002/stellite/.ycm_extra_conf.py
generate ninja script ...
Running: /home/hhd2002/stellite/third_party/depot_tools/gn gen /home/hhd2002/stellite/build_android/src/out_android_armv6/obj
/home/hhd2002/stellite/build_android/.gclient_entries missing, .gclient file in parent directory /home/hhd2002/stellite/build_android might not be the file you want to use.
ERROR at //build/config/android/internal_rules.gni:2483:15: Script returned non-zero exit code.
exec_script("//build/android/gyp/find.py",
^----------
Current dir: /home/hhd2002/stellite/build_android/src/out_android_armv6/obj/
Command: python -- /home/hhd2002/stellite/build_android/src/build/android/gyp/find.py ../../third_party/android_tools/sdk/extras/google/google_play_services/libproject/google-play-services_lib/res
Returned 1.
stderr:

../../third_party/android_tools/sdk/extras/google/google_play_services/libproject/google-play-services_lib/res does not exist

See //build/config/android/rules.gni:704:5: whence it was called.
process_resources(process_resources_target_name) {
^-------------------------------------------------
See //third_party/android_tools/BUILD.gn:112:1: whence it was called.
android_resources("google_play_services_default_resources") {
^------------------------------------------------------------
See //base/BUILD.gn:1092:7: which caused the file to be included.
"//third_party/android_tools:cpu_features",
^-----------------------------------------
Traceback (most recent call last):
File "./tools/build.py", line 2037, in
sys.exit(main(sys.argv[1:]))
File "./tools/build.py", line 2026, in main
build.build()
File "./tools/build.py", line 1382, in build
build.generate_ninja_script(gn_args=gn_context)
File "./tools/build.py", line 829, in generate_ninja_script
self.execute(command, cwd=self.buildspace_src_path)
File "./tools/build.py", line 723, in execute
raise Exception('command execution are failed')
Exception: command execution are failed

```