Add the recipe_modules/blimp for integration bot

scripts/slave/recipe_modules/blimp/api.py

Index: scripts/slave/recipe_modules/blimp/api.py
diff --git a/scripts/slave/recipe_modules/blimp/api.py b/scripts/slave/recipe_modules/blimp/api.py
new file mode 100644
index 0000000000000000000000000000000000000000..9085cb353bd9ac694074cc928b01abcd4d82b76a
--- /dev/null
+++ b/scripts/slave/recipe_modules/blimp/api.py
@@ -0,0 +1,45 @@
+# Copyright 2016 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.
+
+from recipe_engine import recipe_api
+from recipe_engine.config_types import Path
+
+class BlimpApi(recipe_api.RecipeApi):
+  def get_config_defaults(self):

[mikecase (-- gone --), 2016/10/15 00:05:37]

not sure what this does. Do you need it?

[shenghuazhang, 2016/10/17 23:22:07]

Seems like BaseConfig(CHECKOUT_PATH, **_kwargs) in config.py is using this by
default? It somehow calls 'CHECKOUT_PATH' defining in this method.

If remove this, otherwise, the train result would show TypeError:
'TypeError: BaseConfig() takes exactly 1 argument (0 given)'

+    return {
+        'CHECKOUT_PATH': self.m.path['checkout'],
+    }
+
+  def run_engine_forwarder(self, output_linux_dir, **kwargs):

[mikecase (-- gone --), 2016/10/15 00:05:37]

I would change this to be a context manager.

So it would be like 

@contextlib.contextmanager
def engine_forwarder():
  _run_engine_forwarder()
  yield
  _stop_engine_forwarder()

Then people would use it like....

with engine_forwarder():
  do stuff

[shenghuazhang, 2016/10/17 23:22:07]

Done.

+  	args = [
+  		  '-l', output_linux_dir,
+  		  'run',
+  	]
+  	self.m.python('[Blimp] Starting engine and forwarder',
+  		            self.c.client_engine_integration_script,
+  		            args,
+  		            **kwargs)
+
+  # Installs apk in client and runs blimp.
+  def load_client(self, output_linux_dir, apk_path, **kwargs):
+  	args = [
+  		  '-l', output_linux_dir,
+  		  'load',
+  		  '--apk-path', apk_path,
+  	]
+  	self.m.python('[Blimp] Installing apk and running blimp',
+  		            self.c.client_engine_integration_script,
+  		            args,
+  		            **kwargs)
+
+  def stop_engine_forwarder(self, output_linux_dir, **kwargs):
+  	args = [
+  		  '-l', output_linux_dir,
+  		  'stop',
+  	]
+  	self.m.python('[Blimp] Killing engine and forwarder',
+  		            self.c.client_engine_integration_script,
+  		            args,
+  		            **kwargs)
+