Beforematch and hidden-matchable origin trial

Bug: 1117589
Change-Id: Id2e0e344553189018324ebfe30418419944400c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363434
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799910}

third_party/blink/renderer/core/css/properties/longhands/longhands_custom.cc

@@ -5987,17 +5987,14 @@ const CSSValue* ContentVisibility::ParseSingleValue(
     CSSParserTokenRange& range,
     const CSSParserContext& context,
     const CSSParserLocalContext&) const {
-  auto id = range.Peek().Id();
-  if (id == CSSValueID::kHiddenMatchable &&
-      !RuntimeEnabledFeatures::CSSContentVisibilityHiddenMatchableEnabled()) {
+  if (range.Peek().Id() == CSSValueID::kHiddenMatchable &&
+      !RuntimeEnabledFeatures::CSSContentVisibilityHiddenMatchableEnabled(
+          context.GetExecutionContext())) {
     return nullptr;
   }
-  if (!css_parsing_utils::IdentMatches<CSSValueID::kVisible, CSSValueID::kAuto,
-                                       CSSValueID::kHidden,
-                                       CSSValueID::kHiddenMatchable>(id)) {
-    return nullptr;
-  }
-  return css_parsing_utils::ConsumeIdent(range);
+  return css_parsing_utils::ConsumeIdent<CSSValueID::kVisible,
+                                         CSSValueID::kAuto, CSSValueID::kHidden,
+                                         CSSValueID::kHiddenMatchable>(range);
 }
 
 const CSSValue* TabSize::ParseSingleValue(CSSParserTokenRange& range,

third_party/blink/renderer/core/editing/finder/text_finder.cc

@@ -828,7 +828,8 @@ void TextFinder::FireBeforematchEvent(
     return;
   }
 
-  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled()) {
+  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled(
+          GetFrame()->GetDocument()->GetExecutionContext())) {
     Element* beforematch_element = GetBeforematchElement(*context->range);
     // Note that we don't check the `range.EndPosition()` since we just activate
     // the beginning of the range. In find-in-page cases, the end position is

third_party/blink/renderer/core/page/scrolling/element_fragment_anchor.cc

@@ -11,6 +11,7 @@
 #include "third_party/blink/renderer/core/dom/element.h"
 #include "third_party/blink/renderer/core/dom/events/event.h"
 #include "third_party/blink/renderer/core/dom/node.h"
+#include "third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/blink/renderer/core/frame/local_frame.h"
 #include "third_party/blink/renderer/core/svg/svg_svg_element.h"
 #include "third_party/blink/renderer/platform/bindings/script_forbidden_scope.h"
@@ -89,9 +90,11 @@ ElementFragmentAnchor* ElementFragmentAnchor::TryCreate(const KURL& url,
   if (!should_scroll)
     return nullptr;
 
-  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled())
+  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled(
+          frame.GetDocument()->GetExecutionContext())) {
     anchor_node->DispatchEvent(
         *Event::CreateBubble(event_type_names::kBeforematch));
+  }
 
   return MakeGarbageCollected<ElementFragmentAnchor>(*anchor_node, frame);
 }

third_party/blink/renderer/core/page/scrolling/text_fragment_anchor.cc

@@ -485,9 +485,11 @@ void TextFragmentAnchor::ApplyTargetToCommonAncestor(
 }
 
 void TextFragmentAnchor::FireBeforeMatchEvent(Element* element) {
-  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled())
+  if (RuntimeEnabledFeatures::BeforeMatchEventEnabled(
+          frame_->GetDocument()->GetExecutionContext())) {
     element->DispatchEvent(
         *Event::CreateBubble(event_type_names::kBeforematch));
+  }
   beforematch_state_ = kFiredEvent;
 }
 

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -248,6 +248,7 @@
     {
       // https://github.com/WICG/display-locking/blob/master/explainer-beforematch.md
       name: "BeforeMatchEvent",
+      origin_trial_feature_name: "BeforeMatchEvent",
       status: "experimental",
     },
     {
@@ -433,6 +434,7 @@
       // by a different flag.
       // https://wicg.github.io/display-locking/
       name: "CSSContentVisibilityHiddenMatchable",
+      origin_trial_feature_name: "BeforeMatchEvent",
       status: "experimental"
     },
     {