Revert of [Android] Remove adb_commands from telemetry.

tools/telemetry/telemetry/core/android_process.py

Index: tools/telemetry/telemetry/core/android_process.py
diff --git a/tools/telemetry/telemetry/core/android_process.py b/tools/telemetry/telemetry/core/android_process.py
index bfbd293525b734e389d3f00d99e0319125eadc82..62134c2ea9f0a5ffe286c65539cba4516b692272 100644
--- a/tools/telemetry/telemetry/core/android_process.py
+++ b/tools/telemetry/telemetry/core/android_process.py
@@ -2,16 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from telemetry.core.backends import adb_commands
 from telemetry.core.backends.chrome_inspector import devtools_client_backend
-from telemetry.core import util
 from telemetry.core import web_contents
-
-util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'android')
-try:
-  from pylib import ports # pylint: disable=import-error
-except ImportError:
-  ports = None
-
 
 class WebViewNotFoundException(Exception):
   pass
@@ -23,7 +16,7 @@
     self._app_backend = app_backend
     self._pid = pid
     self._name = name
-    self._local_port = ports.AllocateTestServerPort()
+    self._local_port = adb_commands.AllocateTestServerPort()
     self._devtools_client = None
 
   @property