Sources should only write to interaction.state once, not once-per-observer.

Authored by markwei on May 3 2017, 4:23 PM.

Description

Sources should only write to interaction.state once, not once-per-observer.

Summary: Write to interaction.state for TapSource.

Reviewers: O2 Material Motion, O6 Material Android platform reviewers, Material Motion, featherless

Reviewed By: O2 Material Motion, Material Motion, featherless

Tags: Material Motion

Differential Revision: http://codereview.cc/D3153