Triaging layout test failures from FlagExpectations/site-per-process

http/tests/devtools/appcache/appcache-iframe-manifests.js:
- This test was associated with crbug.com/678481 and that
  bug is now fixed, and the test-related expectation has
  already been removed from LayoutTests/TestExpectations
  in r527386

http/tests/media/autoplay/document-user-activation-*
- These tests are flaky regardless of site-per-process
  and are already covered by LayoutTests/TestExpectations.
  This CL just extends TestExpectations entry to also cover Win.

external/wpt/payment-request/allowpaymentrequest/setting-allowpaymentrequest-timing.https.sub.html
- New bug has been opened prior to this CL: https://crbug.com/819800

external/wpt/fullscreen/api/element-ready-check*
- New bug has been opened prior to this CL: https://crbug.com/820617

external/wpt/css/css-fonts/font-display/font-display.html
- This test is simply slow and often takes more than 5 seconds to
  finish - see https://crbug.com/816026#c7
- The timeout of this test is (since 2018-03-12) covered by the main
  LayoutTests/TestExpectations (see r542490).

Other entries removed by this CL simply seem to have "healed" themselves
and are currently passing on the waterfall and on the tryjobs.

Bug: 477150, 794631, 678481, 788390
Bug: 819800, 820617, 788390, 801992
Change-Id: If24ec321df9593ab217f50b7f1b39b3496faceef
Reviewed-on: https://chromium-review.googlesource.com/957683
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542601}

third_party/WebKit/LayoutTests/FlagExpectations/site-per-process

@@ -5,7 +5,7 @@
 crbug.com/802835 external/wpt/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub.html [ Pass ]
 crbug.com/802835 external/wpt/fetch/corb/script-html-correctly-labeled.tentative.sub.html [ Pass ]
 
-# https://crbug.com/794631: Recent regression.
+# https://crbug.com/794631: OOPIFs VS feature policy VS opaque origins?
 crbug.com/794631 virtual/unified-autoplay/external/wpt/feature-policy/autoplay-allowed-by-feature-policy-attribute.https.sub.html [ Failure ]
 crbug.com/794631 virtual/unified-autoplay/external/wpt/feature-policy/autoplay-allowed-by-feature-policy.https.sub.html [ Failure ]
 
@@ -88,7 +88,6 @@ crbug.com/623268 http/tests/devtools/console-cross-origin-iframe-logging.js [ Ti
 crbug.com/645641 external/wpt/html/syntax/parsing/html5lib_tests19.html [ Crash Failure ]
 
 # http/ flaky tests w/ --site-per-process
-crbug.com/678481 http/tests/devtools/appcache/appcache-iframe-manifests.js [ Timeout Pass ]
 crbug.com/678482 http/tests/devtools/debugger/fetch-breakpoints.js [ Timeout Pass ]
 crbug.com/678491 http/tests/misc/webtiming-no-origin.html [ Crash Pass ]
 
@@ -105,11 +104,12 @@ crbug.com/650348 http/tests/webaudio/autoplay-crossorigin.html [ Timeout ]
 # https://crbug.com/778372: Unique name conflict with old entries?
 crbug.com/778372 external/wpt/html/browsers/origin/cross-origin-objects/cross-origin-objects.html [ Crash ]
 
-# https://crbug.com/788390: Autoplay feature policy tests failing on the Windows FYI bot.
-crbug.com/788390 [ Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Timeout ]
-crbug.com/788390 [ Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Timeout ]
-crbug.com/788390 [ Win ] http/tests/media/autoplay/document-user-activation-feature-policy-alternating.html [ Timeout ]
-crbug.com/788390 [ Win ] http/tests/media/autoplay/document-user-activation-feature-policy-iframe-no-gesture.html [ Timeout ]
+# https://crbug.com/819800: Feature policy propagation trouble?  Test synchronization issue?
+crbug.com/819800 external/wpt/payment-request/allowpaymentrequest/setting-allowpaymentrequest-timing.https.sub.html [ Failure ]
+
+# https://crbug.com/820617: Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.
+crbug.com/820617 external/wpt/fullscreen/api/element-ready-check-allowed-cross-origin-manual.sub.html [ Failure ]
+crbug.com/820617 external/wpt/fullscreen/api/element-ready-check-not-allowed-cross-origin-manual.sub.html [ Failure ]
 
 # The tests below set document.domain.  Such tests are skipped, because they
 # cannot work when same-site WPT origins are isolated from each other via
@@ -133,17 +133,7 @@ Bug(none) virtual/sharedarraybuffer/external/wpt/html/infrastructure/safe-passin
 Bug(none) virtual/sharedarraybuffer/external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.sub.html [ Skip ]
 
 # TODO(lukasza, alexmos): Triage these failures.
-Bug(none) external/wpt/IndexedDB/interleaved-cursors.html [ Timeout ]
-Bug(none) external/wpt/xhr/xmlhttprequest-sync-default-feature-policy.sub.html [ Timeout ]
-Bug(none) external/wpt/content-security-policy/frame-ancestors/frame-ancestors-nested-cross-in-same-star-allow.html [ Timeout ]
-Bug(none) external/wpt/css-fonts/font-display/font-display.html [ Crash ]
-Bug(none) external/wpt/fetch/api/basic/keepalive.html [ Timeout ]
-Bug(none) external/wpt/fullscreen/api/element-ready-check-allowed-cross-origin-manual.sub.html [ Failure ]
-Bug(none) external/wpt/fullscreen/api/element-ready-check-not-allowed-cross-origin-manual.sub.html [ Failure ]
 Bug(none) external/wpt/html/browsers/browsing-the-web/navigating-across-documents/004.html [ Timeout ]
-Bug(none) external/wpt/payment-request/allowpaymentrequest/setting-allowpaymentrequest-timing.https.sub.html [ Failure ]
-Bug(none) storage/indexeddb/blob-valid-before-commit.html [ Failure ]
-Bug(none) virtual/outofblink-cors/external/wpt/fetch/api/basic/keepalive.html [ Timeout ]
 
 crbug.com/801992 external/wpt/content-security-policy/frame-ancestors/frame-ancestors-nested-cross-in-cross-url-allow.html [ Pass Timeout ]
 crbug.com/801992 external/wpt/content-security-policy/frame-ancestors/frame-ancestors-nested-cross-in-same-none-block.html [ Pass Timeout ]
@@ -153,7 +143,6 @@ crbug.com/801992 external/wpt/content-security-policy/frame-ancestors/frame-ance
 crbug.com/801992 external/wpt/content-security-policy/frame-ancestors/frame-ancestors-nested-same-in-cross-url-allow.html [ Pass Timeout ]
 crbug.com/801992 external/wpt/content-security-policy/frame-ancestors/frame-ancestors-star-allow-crossorigin.html [ Pass Timeout ]
 crbug.com/801992 external/wpt/html/browsers/the-window-object/security-window/window-security.html [ Pass Timeout ]
-crbug.com/801992 http/tests/misc/iframe-script-modify-attr.html [ Pass Crash ]
 
 crbug.com/711468 virtual/gpu/fast/canvas/canvas-composite-image.html [ Pass Timeout ]
 crbug.com/711468 virtual/gpu/fast/canvas/canvas-scale-strokePath-shadow.html [ Pass Timeout ]

third_party/WebKit/LayoutTests/TestExpectations

@@ -3212,11 +3212,11 @@ crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-clip.htm
 crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-munsell-adobe-to-srgb.html [ Pass Failure ]
 crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-munsell-srgb-to-srgb.html [ Pass Failure ]
 
-# These tests fail often on Linux and Mac. https://crbug.com/790549
-crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html [ Failure Pass Timeout ]
-crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Failure Pass Timeout ]
-crbug.com/788390 [ Linux Mac ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
-crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Failure Pass Timeout ]
+# These tests fail often on Linux and Mac and Windows. https://crbug.com/790549
+crbug.com/788390 [ Linux Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html [ Failure Pass Timeout ]
+crbug.com/788390 [ Linux Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Failure Pass Timeout ]
+crbug.com/788390 [ Linux Mac Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
+crbug.com/788390 [ Linux Win ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-feature-policy-alternating.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-feature-policy-iframe-no-gesture.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-feature-policy-same-origin.html [ Failure Pass Timeout ]