[AW NS] Add flaky tests to the instrumentation test filter

Add some flaky tests that are failing on android_mojo and
android_mojo_rel bots.

Because we use android_mojo bot for CQ these tests
currently block patches that are trying to land.

BUG=936757,939355,841556
Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo

Change-Id: I21052efd28af0f8b693e53df59705db15496e6e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508461Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Auto-Submit: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638653}

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

@@ -37,3 +37,11 @@
 -org.chromium.android_webview.test.AwProxyControllerTest.testValidInput
 -org.chromium.android_webview.test.AwProxyControllerTest.testInvalidProxyUrls
 -org.chromium.android_webview.test.AwProxyControllerTest.testInvalidBypassRules
+
+# Flaky tests on android_mojo and android_mojo_rel bots
+# https://crbug.com/936757, https://crbug.com/939355
+-org.chromium.android_webview.test.AwContentsClientFullScreenTest#testOnShowCustomViewAndPlayWithHtmlControl_videoInsideDiv
+-org.chromium.android_webview.test.AwContentsClientFullScreenTest#testPowerSaveBlockerIsEnabledDuringEmbeddedPlayback
+-org.chromium.android_webview.test.AwContentsClientFullScreenTest#testPowerSaveBlockerIsTransferredToEmbedded
+-org.chromium.android_webview.test.AwContentsClientFullScreenTest#testPowerSaveBlockerIsTransferredToFullscreen
+-org.chromium.android_webview.test.AwContentsClientFullScreenTest#testPowerSaveBlockerIsEnabledDuringFullscreenPlayback_videoInsideDiv