[AW NS] Add CTS test filter for Android WebView

The idea of this CTS filter is similar to the filter we have for
instrumentation tests, i.e.
mojo.fyi.network_webview_instrumentation_test_apk.filter. It contains
failing tests and their corresponding issues / root causes.

The current filter contains results from a local run for a subset of
tests (the actual CTS is not running yet). The CTS filter also
augments the instrumentation test filter for test coverage that is
missing from instrumentation tests.

BUG=903822,902330,841556

Change-Id: I006744652d8ae0a5755f0084704c9f91542d4f8d
Reviewed-on: https://chromium-review.googlesource.com/c/1319677
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606852}

testing/buildbot/filters/mojo.fyi.network_webview_CTS_test.filter

+# These CTS tests currently fail when run with --enable-features=NetworkService,NetworkServiceInProcess
+#
+# Note: webview aims to support running network service in-process, so the
+# tests are also running with NS IP. Multiprocess webview currently does not
+# support running NS OOP, https://crbug.com/882650
+
+# failing tests, https://crbug.com/902330
+android.webkit.cts.WebViewClientTest#testDoUpdateVisitedHistory
+android.webkit.cts.WebViewClientTest#testLoadPage
+android.webkit.cts.WebViewClientTest#testOnFormResubmission
+android.webkit.cts.WebViewClientTest#testOnReceivedError
+android.webkit.cts.WebViewClientTest#testOnReceivedErrorForSubresource
+android.webkit.cts.WebViewClientTest#testOnReceivedHttpAuthRequest
+android.webkit.cts.WebViewClientTest#testOnReceivedHttpError
+android.webkit.cts.WebViewClientTest#testOnReceivedLoginRequest
+android.webkit.cts.WebViewClientTest#testOnSafeBrowsingHit
+android.webkit.cts.WebViewClientTest#testOnScaleChanged
+android.webkit.cts.WebViewClientTest#testShouldOverrideUrlLoading
+android.webkit.cts.WebViewClientTest#testShouldOverrideUrlLoadingOnCreateWindow
+
+# passing tests
+android.webkit.cts.WebViewClientTest#testOnRenderProcessGone
+android.webkit.cts.WebViewClientTest#testOnRenderProcessGoneDefault
+android.webkit.cts.WebViewClientTest#testOnUnhandledKeyEvent
+android.webkit.cts.WebViewClientTest#testShouldOverrideKeyEvent
+android.webkit.cts.WebViewClientTest#testShouldOverrideUrlLoadingDefault
+
+# failing for other reasons, to determine more precisely
+android.webkit.cts.WebViewClientTest#testShouldInterceptRequestParams
+android.webkit.cts.WebViewClientTest#testShouldInterceptRequestResponse