cc: Add mailbox support to ResourceProvider write locks.
This adds support for mailboxes to ScopedWriteLockGL. Using the mailbox
requires using ScopedTextureProvider/ScopedSkSurfaceProvider which
ensures that the texture id for the mailbox is destroyed after use on
the worker context.
This CL also includes the following cleanup:
1. ResourceProvider locks don't keep resource pointers around.
2. ScopedSamplerGL does not inherit from ScopedReadLockGL.
3. GpuRasterizer is folded back into GpuRasterBufferProvider.
4. TileTaskManager does not own RasterBufferProvider.
BUG=525259
R=piman@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Committed: https://crrev.com/5fa5dbdf25bbec21b84f752d3f0642cd184467e2
Review-Url: https://codereview.chromium.org/1951193002
Cr-Original-Commit-Position: refs/heads/master@{#398204}
Cr-Commit-Position: refs/heads/master@{#399983}
34 files changed
