Revert of [Android] Remove android_commands and android_testrunner.

Revert of [Android] Remove android_commands and android_testrunner. (patchset #3 id:40001 of https://codereview.chromium.org/1290773009/ )

Reason for revert:
This seems to have broken the Google Chrome Linux x64 build

Output:
FAILED: cd ../../content; python ../tools/isolate_driver.py check --isolated "../out/Release/telemetry_gpu_unittests.isolated" --isolate "telemetry_gpu_unittests.isolate" --path-variable DEPTH .. --path-variable PRODUCT_DIR "../out/Release " --extra-variable "version_full=46.0.2482.0" --config-variable "CONFIGURATION_NAME=Release" --config-variable "OS=linux" --config-variable "asan=0" --config-variable "branding=Chrome" --config-variable "chromeos=0" --config-variable "component=static_library" --config-variable "disable_nacl=0" --config-variable "enable_pepper_cdms=1" --config-variable "enable_plugins=1" --config-variable "fastbuild=0" --config-variable "icu_use_data_file_flag=1" --config-variable "internal_gles2_conform_tests=0" --config-variable "kasko=0" --config-variable "libpeer_target_type=static_library" --config-variable "lsan=0" --config-variable "msan=0" --config-variable "target_arch=x64" --config-variable "tsan=0" --config-variable "use_custom_libcxx=0" --config-variable "use_instrumented_libraries=0" --config-variable "use_prebuilt_instrumented_libraries=0" --config-variable "use_openssl=1" --config-variable "use_ozone=0" --config-variable "use_x11=1" --config-variable "v8_use_external_startup_data=1"
Failed to find an input file: /b/build/slave/google-chrome-rel-linux_64/build/src/third_party/android_testrunner/ is not a directory but ends with "/"

Original issue's description:
> [Android] Remove android_commands and android_testrunner.
>
> Good riddance.
>
> BUG=267773
>
> Committed: https://crrev.com/d71baced2e55f9f102189c490908e3c631a790e2
> Cr-Commit-Position: refs/heads/master@{#343210}

TBR=craigdh@chromium.org,nednguyen@google.com,perezju@chromium.org,sullivan@chromium.org,thakis@chromium.org,jbudorick@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=267773
Committed: https://crrev.com/b0e8b5904780100ed6793e4cca9215e3c453b857
Cr-Commit-Position: refs/heads/master@{#343219}

[csharp, 2015-08-13 16:49:41]

Created Revert of [Android] Remove android_commands and android_testrunner.

[commit-bot: I haz the power, 2015-08-13 16:49:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1288993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1288993002/1

[commit-bot: I haz the power, 2015-08-13 16:50:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-13 16:51:42]

Patchset 1 (id:??) landed as
https://crrev.com/b0e8b5904780100ed6793e4cca9215e3c453b857
Cr-Commit-Position: refs/heads/master@{#343219}