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Previously for a cc::Layer to have debug info (e.g. layer name, and
information for tracing, inspection, etc.), we needed to create an
instance of LayerClient implementation for the layer, and the layer
pulled debug info from the client during frame update.

Now change the pull model to push model to simplify clients, and
remove cc::LayerClient.

This fixes the issue in CompositeAfterPaint that foreign layers lack
layer names.

Change-Id: I06bbe689c8c9ee56be3c8dea8eb6b480faadc5d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906895
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715049}