Previously everything lived in an inner class method of
SettingsRobolectricTestRunner. That method has now been turned into
a static method so that it can be called by other runners.
Bug: 62460102
Test: robotests
Change-Id: I6612b1f26404587301c534c8ba60e39d59d6c840
It takes 3-4 seconds to load the battery settings page in Ryu. Main
reason is that it takes too long to init BatteryStatsHelper.
This cl moves loading code to AsyncLoader, and we will refresh ui once
the loading part is finished.
Following cl will add animation for the battery header to make it not
so janky
Bug: 37196170
Test: RunSettingsRoboTest
Change-Id: I40dfdde4a072e28a56c8fdf0ec6d671b5109fc6d