[telemetry] Install PushAppsToBackground apk

telemetry/telemetry/internal/platform/android_platform_backend.py

Index: telemetry/telemetry/internal/platform/android_platform_backend.py
diff --git a/telemetry/telemetry/internal/platform/android_platform_backend.py b/telemetry/telemetry/internal/platform/android_platform_backend.py
index 3b57f66779275d245392320e15b66ce60fb323f7..45313b3ac091f0631b3f08f8716df21af140cd4f 100644
--- a/telemetry/telemetry/internal/platform/android_platform_backend.py
+++ b/telemetry/telemetry/internal/platform/android_platform_backend.py
@@ -238,6 +238,22 @@ class AndroidPlatformBackend(
       android_prebuilt_profiler_helper.GetDevicePath('memtrack_helper'),
       '-d'], as_root=True, check_return=True)
 
+  def EnsureBackgroundApkInstalled(self):
+    name = 'PushAppsToBackground.apk'
+    directories = util.GetBuildDirectories()

[nednguyen, 2016/10/10 18:42:31]

Hmhh, don't rely on this method. Instead, use dependency_manager to fetch the
apk instead. To do this, you need:
1) Upload the apk to cloud storage.
2) Add an entry to telemetry/telemetry/internal/binary_dependencies.json
3) Switch android_prebuilt_profiler_helper.InstallOnDevice(self._device,
'PushAppsToBackground'):

+    if not directories:
+      raise Exception("Error installing PushAppsToBackground.apk:"
+                      "No build directories found.")
+    possible_paths = [os.path.join(d, 'apks', name) for d in directories]
+    paths = [path for path in possible_paths if os.path.exists(path)]
+    if not paths:
+      raise Exception("Error installing PushAppsToBackground.apk: "
+                      "Couldn't find apk. Looked for it at: "
+                      "\n".join(possible_paths))
+    # Choose the first path
+    path = paths[0]
+    self.InstallApplication(path)
+
   def PurgeUnpinnedMemory(self):
     """Purges the unpinned ashmem memory for the whole system.