Let SkPictureBuilder be DisplayItemClient

Some objects implement DisplayItemClient just because they are painted
on SkPictureBuilder. Let SkPictureBuilder be DisplayItemClient can
reduce number of DisplayItemClient implementations. We don't need to
bother their implementation of visualRect() and future client-side
caching status methods.

Review-Url: https://codereview.chromium.org/1931133002
Cr-Commit-Position: refs/heads/master@{#390572}
8 files changed