android: Use a hard coded BeginFrame deadline

android: Use a hard coded BeginFrame deadline

The previous estimation logic measures the time from when the
Browser receives the Renderer swap to when the Browser swaps,
which may include idle time when the Renderer is in a high
latency mode.

This often prevented us from detecting that we can recover
that latency.

The correct estimation logic will look completely different for
Surfaces vs. Android's current path; so the plan is to use a
hard coded for now and use estimation logic again once
Surfaces come to Android.

BUG=510623

Review URL: https://codereview.chromium.org/1244443003

Cr-Commit-Position: refs/heads/master@{#339114}