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This allows webview debugging to be specified at
PlatformViewsAsyncService creation.

Merge-With: eureka-internal/369473
Bug: Internal b/149833693
Test: NONE
Change-Id: Ia9b02cd6f59e1343b4fce70ed639196f80a03010
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079033Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Shawn Gallea <sagallea@google.com>
Cr-Commit-Position: refs/heads/master@{#745132}