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Both WebView's and Chrome's cache clearing APIs do the following:
1) Clear the GL shader cache, which corresponds to DATA_TYPE_CACHE in
the language of browser_data_remover.h.
2) Clear the Blink cache of the renderers.

This CL implements the first part in WebLayer.

Change-Id: Ib29edf65bf36bd85c912f02b2e2bce918d7084ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883655
Commit-Queue: Pavel Shmakov <pshmakov@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710788}