Reorganize Android's test scripts into packages.

build/android/pylib/gtest/single_test_runner.py

Index: build/android/pylib/gtest/single_test_runner.py
diff --git a/build/android/pylib/single_test_runner.py b/build/android/pylib/gtest/single_test_runner.py
similarity index 97%
rename from build/android/pylib/single_test_runner.py
rename to build/android/pylib/gtest/single_test_runner.py
index ad19ab5d9cb98be39e4d94bb831beb95de1a5b2c..23c795e22ed4705d32d4ce8778ba1354c1d086ed 100644
--- a/build/android/pylib/single_test_runner.py
+++ b/build/android/pylib/gtest/single_test_runner.py
@@ -7,16 +7,17 @@ import logging
 import os
 import sys
 
-import android_commands
-from android_commands import errors
-from base_test_runner import BaseTestRunner
-import constants
+from pylib import android_commands
+from pylib import constants
+from pylib import perf_tests_helper
+from pylib.android_commands import errors
+from pylib.base_test_runner import BaseTestRunner
+from pylib.test_result import BaseTestResult, TestResults
+from pylib.utils import run_tests_helper
+
 import debug_info
-import perf_tests_helper
 from test_package_apk import TestPackageApk
 from test_package_executable import TestPackageExecutable
-from test_result import BaseTestResult, TestResults
-from utils import run_tests_helper
 
 
 class SingleTestRunner(BaseTestRunner):