Use MediaMetadataRetriever.setDataSource(Context, Uri) for "content" scheme.

This cl will fix the bug reported at https://crbug.com/253465#c26.
With this patch, MediaMetadataRetriever can get the metadata of the local video file which is selected with the file input element.

BUG=253465

Review URL: https://codereview.chromium.org/1626283002

Cr-Commit-Position: refs/heads/master@{#371786}
2 files changed