Rebaseline oscillator sawtooth and triangle tests for Android.

Noticed that these are failing on Android. The difference between the new and old results is less than about 6 units (out of 32K).

BUG=
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/214353004

git-svn-id: svn://svn.chromium.org/blink/trunk@170783 bbb929c8-8fbe-4397-9dbb-9b2b20218538