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This CL adapts webview tests to run with committed interstitials
enabled, and fixes WebViewClient callback invocation issues with CI.

All SafeBrowsing CTS tests pass with CI as of this CL, except for
android.webkit.cts.WebViewClientTest#testOnSafeBrowsingHit which is
fixed in the follow-up CL.

Tests will be enabled for committed interstitials using
fieldtrial_testing_config.json once the blocking bugs are fixed.

Bug: 1031315, 1022477

Change-Id: Iadf1848cd91c29fd3b841429f74fb4e3464a055f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909276
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735185}