android: Use DisplayAndroid in java
This replaces usage of java DeviceDisplayInfo with DisplayAndroid.
Unfortunately java code generally only pass around the Context instead
of WindowAndroid, so need to officially expose the DisplayAndroid.get
method to the public.
The rest is pretty easy. Only had to add getDIPScale.
BUG=
625089
Committed:
https://crrev.com/ca85be85c0bf1d91b9d06b50c2216e7a7394d4df
Cr-Commit-Position: refs/heads/master@{#423806}