Fieldset NG: Enable the feature as "experimental"

Change the runtime flag status to "experimental", and remove
virtual/layout_ng_fieldset/.

Known issues:

* inert-retargetting*.tentative.html:
  They have CHECK failures in |NGPhysicalBoxFragment::
  CheckSameForSimplifiedLayout()|

* contain-intrinsic-size-014.html: Fieldset NG doesn't support size
  containment yet.

* fieldset-mask.html: Fieldset NG needs to adjust mask painting area.

We'll address them soon.

Bug: 375693, 875235
Change-Id: Id051f04c7e0fe862e26305b27c106abdee75ba1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340647Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795951}

content/test/data/accessibility/html/legend-expected-blink.txt

@@ -11,7 +11,6 @@ rootWebArea
 ++++++++++textField
 ++++++++++++genericContainer
 ++++++++++staticText name=' Rendering Engine: '
-++++++++++++inlineTextBox name=' '
-++++++++++++inlineTextBox name='Rendering Engine: '
+++++++++++++inlineTextBox name=' Rendering Engine: '
 ++++++++++textField
 ++++++++++++genericContainer

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -953,7 +953,7 @@
       // provides a convenient way for testing legacy layout code path in blink
       // unit tests.
       name: "LayoutNG",
-      implied_by: ["LayoutNGFieldset", "LayoutNGGrid", "BidiCaretAffinity", "LayoutNGTable"],
+      implied_by: ["LayoutNGGrid", "BidiCaretAffinity", "LayoutNGTable"],
       status: "stable",
     },
     {
@@ -961,6 +961,8 @@
     },
     {
       name: "LayoutNGFieldset",
+      depends_on: ["LayoutNG"],
+      status: "experimental",
     },
     {
       name: "LayoutNGFlexBox",

third_party/blink/web_tests/FlagExpectations/composite-after-paint

@@ -10,7 +10,6 @@ http/tests/devtools/tracing/* [ Skip ]
 virtual/composite-after-paint/* [ Skip ]
 
 virtual/layout_ng_block_frag/* [ Skip ]
-virtual/layout_ng_fieldset/* [ Skip ]
 virtual/layout_ng_fragment_traversal/* [ Skip ]
 virtual/prefer_compositing_to_lcd_text/compositing/overflow/* [ Skip ]
 virtual/stable/* [ Skip ]

third_party/blink/web_tests/FlagExpectations/disable-layout-ng

@@ -410,6 +410,7 @@ crbug.com/591099 fast/css/text-overflow-ellipsis-button.html [ Failure ]
 crbug.com/591099 fast/writing-mode/flipped-blocks-inline-map-local-to-container.html [ Failure ]
 
 ### external/wpt/html/rendering
+crbug.com/591099 external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-vertical.html [ Failure ]
 crbug.com/875235 external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-painting-order.html [ Failure ]
 
 ### virtual/text-antialias/
@@ -439,9 +440,6 @@ virtual/controls-refresh-hc/* [ Skip ]
 ### virtual/layout_ng_block_frag/
 virtual/layout_ng_block_frag/* [ Skip ]
 
-### virtual/layout_ng_fieldset/
-virtual/layout_ng_fieldset/* [ Skip ]
-
 ### virtual/layout_ng_fragment_traversal/
 virtual/layout_ng_fragment_traversal/* [ Skip ]
 

third_party/blink/web_tests/TestExpectations

@@ -914,7 +914,6 @@ crbug.com/591099 [ Mac ] fast/multicol/file-upload-as-multicol.html [ Failure ]
 # LayoutNG failures that needs to be triaged
 crbug.com/591099 virtual/text-antialias/selection/selection-rect-line-height-too-small.html [ Failure ]
 crbug.com/591099 external/wpt/css/css-text/hyphens/hyphens-out-of-flow-002.html [ Failure ]
-crbug.com/591099 external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-vertical.html [ Failure ]
 crbug.com/591099 fast/css-intrinsic-dimensions/width-avoid-floats.html [ Failure ]
 crbug.com/591099 fast/selectors/shadow-host-div-with-span.html [ Failure ]
 crbug.com/591099 fast/selectors/shadow-host-div-with-text.html [ Failure ]
@@ -1296,9 +1295,13 @@ virtual/layout_ng_fragment_traversal/external/wpt/css/CSS2/text/* [ Skip ]
 # Fieldset in NG
 #
 
-## Fieldseet in NG - Passing reference tests
-crbug.com/875235 virtual/layout_ng_block_frag/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-vertical.html [ Pass ]
-crbug.com/875235 virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-vertical.html [ Pass ]
+# A simpified Layout issue
+crbug.com/875235 external/wpt/inert/inert-retargeting-iframe.tentative.html [ Crash Pass ]
+crbug.com/875235 external/wpt/inert/inert-retargeting.tentative.html [ Crash Pass ]
+# Size containment
+crbug.com/875235 external/wpt/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-014.html [ Failure ]
+# Mask paiting area
+crbug.com/875235 paint/masks/fieldset-mask.html [ Failure ]
 
 
 # ====== LayoutNG-only failures until here ======

third_party/blink/web_tests/VirtualTestSuites

@@ -253,14 +253,6 @@
               "fast/table"],
     "args": ["--enable-blink-features=LayoutNGFragmentTraversal"]
   },
-  {
-    "prefix": "layout_ng_fieldset",
-    "bases": ["external/wpt/css/css-contain",
-              "external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain",
-              "external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements",
-              "fast/forms/fieldset"],
-    "args": ["--enable-blink-features=LayoutNGFieldset"]
-  },
   {
     "prefix": "layout-ng-grid",
     "bases": ["fast/css-grid-layout",

third_party/blink/web_tests/platform/mac/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt → third_party/blink/web_tests/flag-specific/disable-layout-ng/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

 This is a testharness.js-based test.
 PASS div[align=left] legend
-PASS div[align=center] legend
-PASS div[align=right] legend
+FAIL div[align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394
+FAIL div[align=right] legend assert_equals: expected legend[align=left] expected 24 but got 764
 PASS div[align=justify] legend
 FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 394
 FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394

third_party/blink/web_tests/platform/linux/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

 This is a testharness.js-based test.
 PASS div[align=left] legend
-FAIL div[align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394
-FAIL div[align=right] legend assert_equals: expected legend[align=left] expected 24 but got 764
+PASS div[align=center] legend
+PASS div[align=right] legend
 PASS div[align=justify] legend
 FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 394
 FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394

third_party/blink/web_tests/platform/linux/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

-This is a testharness.js-based test.
-PASS div[align=left] legend
-PASS div[align=center] legend
-PASS div[align=right] legend
-PASS div[align=justify] legend
-FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 394
-FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394
-PASS legend[style="margin: 0 auto"]
-PASS legend[style="margin: 0 0 0 auto"]
-PASS fieldset[dir=rtl] legend
-FAIL fieldset[dir=rtl] legend[style="text-align: left"] assert_equals: expected legend[align=right] expected 764 but got 24
-Harness: the test ran to completion.
-

third_party/blink/web_tests/platform/mac/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-flexbox-expected.txt

-This is a testharness.js-based test.
-FAIL Flex assert_equals: height expected "18px" but got "162px"
-FAIL Inline flex assert_equals: height expected "18px" but got "162px"
-FAIL Dynamic change of flex-direction assert_equals: expected 44 but got 26
-Harness: the test ran to completion.
-

third_party/blink/web_tests/platform/mac/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-grid-expected.txt

-This is a testharness.js-based test.
-FAIL Grid assert_equals: height expected "86px" but got "162px"
-FAIL Inline grid assert_equals: height expected "86px" but got "162px"
-Harness: the test ran to completion.
-

third_party/blink/web_tests/platform/mac/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

 This is a testharness.js-based test.
 PASS div[align=left] legend
-FAIL div[align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394
-FAIL div[align=right] legend assert_equals: expected legend[align=left] expected 24 but got 764
+PASS div[align=center] legend
+PASS div[align=right] legend
 PASS div[align=justify] legend
 FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 394
 FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 394

third_party/blink/web_tests/platform/win/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-flexbox-expected.txt

-This is a testharness.js-based test.
-FAIL Flex assert_equals: height expected "20px" but got "180px"
-FAIL Inline flex assert_equals: height expected "20px" but got "180px"
-FAIL Dynamic change of flex-direction assert_equals: expected 48 but got 28
-Harness: the test ran to completion.
-

third_party/blink/web_tests/platform/win/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

 This is a testharness.js-based test.
 PASS div[align=left] legend
-FAIL div[align=center] legend assert_equals: expected legend[align=left] expected 24 but got 395
-FAIL div[align=right] legend assert_equals: expected legend[align=left] expected 24 but got 765
+PASS div[align=center] legend
+PASS div[align=right] legend
 PASS div[align=justify] legend
 FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 395
 FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 395

third_party/blink/web_tests/platform/win/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-align-expected.txt

-This is a testharness.js-based test.
-PASS div[align=left] legend
-PASS div[align=center] legend
-PASS div[align=right] legend
-PASS div[align=justify] legend
-FAIL div[style="text-align: center"] legend assert_equals: expected legend[align=left] expected 24 but got 395
-FAIL div[style="text-align: center"][align=center] legend assert_equals: expected legend[align=left] expected 24 but got 395
-PASS legend[style="margin: 0 auto"]
-PASS legend[style="margin: 0 0 0 auto"]
-PASS fieldset[dir=rtl] legend
-FAIL fieldset[dir=rtl] legend[style="text-align: left"] assert_equals: expected legend[align=right] expected 765 but got 24
-Harness: the test ran to completion.
-

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/css/css-contain/README.txt

-LayoutNG experimental css-contain tests.

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/README.txt

-LayoutNG experimental css-contain tests.
-

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/README.txt

-These tests are run with --enable-blink-features=LayoutNGFieldset
-The LayoutNG project is described here: http://goo.gl/1hwhfX

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-flexbox-expected.txt

-This is a testharness.js-based test.
-PASS Flex
-PASS Inline flex
-PASS Dynamic change of flex-direction
-Harness: the test ran to completion.
-

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-grid-expected.txt

-This is a testharness.js-based test.
-PASS Grid
-PASS Inline grid
-Harness: the test ran to completion.
-

third_party/blink/web_tests/virtual/layout_ng_fieldset/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-percentage-block-size-expected.txt

-This is a testharness.js-based test.
-PASS rendered legend (writing-mode: horizontal-tb)
-PASS second legend (writing-mode: horizontal-tb)
-PASS div (writing-mode: horizontal-tb)
-PASS rendered legend (writing-mode: vertical-lr)
-PASS second legend (writing-mode: vertical-lr)
-PASS div (writing-mode: vertical-lr)
-PASS rendered legend (writing-mode: vertical-rl)
-PASS second legend (writing-mode: vertical-rl)
-PASS div (writing-mode: vertical-rl)
-Harness: the test ran to completion.
-

third_party/blink/web_tests/virtual/layout_ng_fieldset/fast/forms/fieldset/README.txt

-These tests are run with --enable-blink-features=LayoutNGFieldset
-The LayoutNG project is described here: http://goo.gl/1hwhfX