adb_profile_chrome: Refactor into multiple modules and add tests

build/android/chrome_profiler/controllers.py

Index: build/android/chrome_profiler/controllers.py
diff --git a/build/android/chrome_profiler/controllers.py b/build/android/chrome_profiler/controllers.py
new file mode 100644
index 0000000000000000000000000000000000000000..a569dbc0488422c27458bcd45296884490583f6c
--- /dev/null
+++ b/build/android/chrome_profiler/controllers.py
@@ -0,0 +1,16 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import exceptions
+
+# pylint: disable=R0201
+class BaseController(object):
+  def StartTracing(self, _):
+    raise exceptions.NotImplementError
+
+  def StopTracing(self):
+    raise exceptions.NotImplementError
+
+  def PullTrace(self):
+    raise exceptions.NotImplementError