Ensure all forced colors properties are stored in a rare data structure

This change updates the field_group of all the internal forced colors
properties to "*" to ensure that they are all stored in a rare data
structure.

Bug: 970285
Change-Id: Ibfdac0b40980824e79eab51f9f42e807d94eda97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566691Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Alison Maher <almaher@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#833845}

third_party/blink/renderer/core/css/css_properties.json5

@@ -6065,8 +6065,6 @@
     },
 
     // Forced colors properties.
-    // TODO(almaher): add forced colors properties to a separate raredata
-    // structure.
     {
       name: "-internal-forced-background-color",
       property_methods: ["ParseSingleValue", "CSSValueFromComputedStyleInternal", "ColorIncludingFallback"],
@@ -6101,7 +6099,7 @@
       name: "-internal-forced-color",
       property_methods: ["ParseSingleValue", "CSSValueFromComputedStyleInternal", "ColorIncludingFallback"],
       inherited: true,
-      field_group: "inherited",
+      field_group: "*",
       field_template: "external",
       include_paths: ["third_party/blink/renderer/core/layout/layout_theme.h"],
       default_value: "StyleColor(CSSValueID::kCanvastext)",
@@ -6130,7 +6128,7 @@
       visited_property_for: "-internal-forced-color",
       property_methods: ["ParseSingleValue", "ColorIncludingFallback"],
       inherited: true,
-      field_group: "inherited",
+      field_group: "*",
       field_template: "external",
       include_paths: ["third_party/blink/renderer/core/layout/layout_theme.h"],
       default_value: "StyleColor(CSSValueID::kCanvastext)",