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Webview currently crashes on context loss:
https://source.chromium.org/chromium/chromium/src/+/master:android_webview/browser/gfx/output_surface_provider_webview.cc;drc=8bab2d6d39d8399e64d5f8369226403495e86d98;l=38

So that provides a shortcut for enabling vulkan for webview without
having proper clean up.

Move the kWebViewEnableVulkan to gpu/config, and use it to enable vulkan
for in-process gpu, only on android.

Bug: 1095744
Change-Id: Idcf0df6f2776012c2ea695d161f457ad48dde203
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499219
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820971}