Basic android app implementation

tools/telemetry/telemetry/core/backends/android_app_backend.py

Index: tools/telemetry/telemetry/core/backends/android_app_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/android_app_backend.py b/tools/telemetry/telemetry/core/backends/android_app_backend.py
index ddd84688b458fc971aafe2c967044cc2f2f6b5c2..b949e4f4a62ede203ab4bc18404d8f3697495df0 100644
--- a/tools/telemetry/telemetry/core/backends/android_app_backend.py
+++ b/tools/telemetry/telemetry/core/backends/android_app_backend.py
@@ -2,9 +2,36 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import time
+
 from telemetry.core.backends import app_backend
+from telemetry.core.platform import android_platform_backend as \
+  android_platform_backend_module
+  
+class AndroidAppBackend(app_backend.AppBackend):
+  def __init__(self, android_platform_backend, start_intent):
+    super(AndroidAppBackend, self).__init__(app_type=start_intent.package)
+    assert isinstance(android_platform_backend,
+                      android_platform_backend_module.AndroidPlatformBackend)
+    self._android_platform_backend = android_platform_backend
+    self._start_intent = start_intent
 
+  @property
+  def _adb(self):
+    return self._android_platform_backend.adb
 
-class AndroidAppBackend(app_backend.AppBackend):
-  def __init__(self):
-    super(AndroidAppBackend, self).__init__()
+  def Start(self):
+
+    self._adb.device().StartActivity(self._start_intent, blocking=False)
+
+    # Wait for the app to come up.
+    #
+    # HACK(chrishenry): Need a better way to do this. For a
+    # WebView-based app, where the app brings up WebView at startup,
+    # we can wait for the WebView, for other app, need to figure out
+    # the right thing to do here.

[chrishenry, 2014/12/05 06:21:01]

Update the HACK comment to say something about checking ps and adding
ready_state_predicate to UserStory.

[slamm, 2014/12/05 18:19:23]

Instead of searching for the app in 'ps', I changed a StartActivity param:

   StartActivity(..., blocking=True)

If that does not actually do what we want, we can go back to the ps command
idea.

I added a doc string with the customization comment.

[chrishenry, 2014/12/05 18:22:36]

There was a comment from wuhu in the original hackathon patch: "# TODO(wuhu):
GOOGLE_SEARCH intent does not signal completion." Can we make sure we test this
and confirm that it still works?

+    import logging; logging.warn('Sleeping after start.')

[nednguyen, 2014/12/05 02:24:06]

Let's just wait for pid to come up in this one. Custom shared_user_story_state
can do further waiting that's specific to app.

[slamm, 2014/12/05 18:19:23]

Acknowledged.

+    time.sleep(10)

[chrishenry, 2014/12/05 06:21:01]

Let's keep this here, but update the HACK remark to say that we should use ps
hack for a default mechanism + an option in AppStory to customize the
wait-for-ready-state.

And kill the import logging stuff above.

[slamm, 2014/12/05 18:19:23]

Done.

+    
+  def Close(self):
+    self._android_platform_backend.KillApplication(self._start_intent.package)