[mpc] Make text-decoration properties computed_value_comparable

Bug: 1057072
Change-Id: I1329af49c97d1cd4bec073334c0b8d23645758bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209081
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771543}

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

@@ -3550,6 +3550,7 @@
       affected_by_forced_colors: true,
       valid_for_first_letter: true,
       valid_for_cue: true,
+      computed_value_comparable: true,
     },
     {
       name: "text-decoration-line",
@@ -3564,6 +3565,7 @@
       converter: "ConvertFlags<TextDecoration>",
       valid_for_first_letter: true,
       valid_for_cue: true,
+      computed_value_comparable: true,
     },
     {
       name: "text-decoration-skip-ink",
@@ -3576,6 +3578,7 @@
       default_value: "auto",
       valid_for_first_letter: true,
       valid_for_cue: true,
+      computed_value_comparable: true,
     },
     {
       name: "text-decoration-style",
@@ -3587,12 +3590,12 @@
       default_value: "solid",
       valid_for_first_letter: true,
       valid_for_cue: true,
+      computed_value_comparable: true,
     },
     {
       name: "text-decoration-thickness",
       runtime_flag: "UnderlineOffsetThickness",
       property_methods: ["ParseSingleValue", "CSSValueFromComputedStyleInternal"],
-      # TODO: Move to core/style?
       include_paths: ["third_party/blink/renderer/core/style/text_decoration_thickness.h"],
       inherited: true,
       field_group: "*",
@@ -3603,6 +3606,7 @@
       keywords: ["auto", "from-font"],
       typedom_types: ["Keyword", "Length", "Percentage"],
       valid_for_first_letter: true,
+      computed_value_comparable: true,
     },
     {
       name: "text-indent",

third_party/blink/renderer/core/css/properties/css_property_test.cc

@@ -156,6 +156,9 @@ const char* length_or_none_examples[] = {"none", "1px", "2px", "5%", nullptr};
 const char* length_size_examples[] = {"4px", "1px 2px", "3%", "calc(1% + 1px)",
                                       nullptr};
 const char* line_width_examples[] = {"medium", "thin", "100px", nullptr};
+const char* none_auto_examples[] = {"none", "auto", nullptr};
+const char* text_decoration_line_examples[] = {"none", "underline", nullptr};
+const char* text_decoration_style_examples[] = {"solid", "dashed", nullptr};
 const char* vertical_align_examples[] = {"sub", "super", "1px", "3%", nullptr};
 const char* writing_mode_examples[] = {"horizontal-tb", "vertical-rl", nullptr};
 
@@ -189,6 +192,11 @@ struct ComputedValuesEqualData {
     {"min-height", length_or_auto_examples},
     {"min-width", length_or_auto_examples},
     {"right", length_or_auto_examples},
+    {"text-decoration-color", color_examples},
+    {"text-decoration-line", text_decoration_line_examples},
+    {"text-decoration-skip-ink", none_auto_examples},
+    {"text-decoration-style", text_decoration_style_examples},
+    {"text-decoration-thickness", length_or_auto_examples},
     {"top", length_or_auto_examples},
     {"vertical-align", vertical_align_examples},
     {"width", length_or_auto_examples},