Add adb support to skpbench

tools/skpbench/_adb.py

Index: tools/skpbench/_adb.py
diff --git a/tools/skpbench/_adb.py b/tools/skpbench/_adb.py
new file mode 100644
index 0000000000000000000000000000000000000000..6125c8d538fa8cc46ad338abd6d4ef1d1315080a
--- /dev/null
+++ b/tools/skpbench/_adb.py
@@ -0,0 +1,19 @@
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import subprocess
+
+def shell(cmd, device_serial=None):
+  if device_serial is None:
+    subprocess.call(['adb', 'shell', cmd])
+  else:
+    subprocess.call(['adb', '-s', device_serial, 'shell', cmd])
+
+def check(cmd, device_serial=None):
+  if device_serial is None:
+    out = subprocess.check_output(['adb', 'shell', cmd])
+  else:
+    out = subprocess.check_output(['adb', '-s', device_serial, 'shell', cmd])
+  return out.rstrip()