Move the rest of files in renderer/ to main_thread/.

The directory structure for Blink scheduler is changing, and those files
should live in scheduler/main_thread/.

Bug: 826203
Change-Id: Iff32a4b8d53788e096d86cd6bef74da7978d1c44
Reviewed-on: https://chromium-review.googlesource.com/c/1301694
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603433}
9 files changed