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Previously cc::Layer::DebugName() called LayerClient::TakeDebugInfo()
which has side-effect to clear some debug information (e.g. raster
invalidation tracking), causing layer name dump to interfere with
raster invalidation tracking.

Add the new method to avoid the problem.

R=pdr@chromium.org
TBR= # trivial change under ui/compositor.

Change-Id: Ia4850298f8bc5a2a003dc92a00bda903a3b099d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850964
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704711}