Add a fast-path for independent inherited properties

third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
index 241ed5cbcfedaca0cf9d17382d629555c865440e..5f73114d7b3147a53a1d4ea6dced752bcd3b604d 100644
--- a/third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
@@ -43,6 +43,9 @@ state.style()->{{property.setter}}
 {{set_value(property)}}(toCSSPrimitiveValue(value).convertTo<{{property.type_name}}>());
 {%- endif %}
 {% endmacro %}
+{% macro set_is_inherited(property) %}
+state.style()->{{property.is_inherited_setter}}
+{% endmacro %}
 
 namespace blink {
 
@@ -58,6 +61,9 @@ namespace blink {
     {% else %}
     {{set_value(property)}}(ComputedStyle::{{property.initial}}());
     {% endif %}
+    {% if property.independent %}
+    {{set_is_inherited(property)}}(true);

[rune, 2016/08/18 08:06:49]

Shouldn't this be false? Last time I looked I thought initial and inherit were
both flipped.

[sashab, 2016/08/19 05:35:25]

Oops, nice catch! Not sure how that happened, yes, this should definitely be
false

+    {% endif %}
 }
 
 {% endif %}
@@ -71,6 +77,9 @@ namespace blink {
     {% else %}
     {{set_value(property)}}(state.parentStyle()->{{property.getter}}());
     {% endif %}
+    {% if property.independent %}
+    {{set_is_inherited(property)}}(true);

[sashab, 2016/08/18 04:47:14]

Fix for hidden tabs problem - crbug.com/634254

+    {% endif %}
 }
 
 {% endif %}
@@ -78,6 +87,9 @@ namespace blink {
 {{declare_value_function(property_id)}}
 {
     {{convert_and_set_value(property)}}
+    {% if property.independent %}
+    {{set_is_inherited(property)}}(false);
+    {% endif %}
 }
 
 {% endif %}