[CSS Typed OM] Implement CSSUnit::to for fixed length types

third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html

Index: third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html
diff --git a/third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html b/third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html
index 00f1a128e402a7d6de0852f0bcc466b97cf8446b..bccac27482f264a96936c1508ddfb27610958908 100644
--- a/third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html
+++ b/third_party/WebKit/LayoutTests/typedcssom/cssUnitValue_toMethod.html
@@ -12,6 +12,15 @@ let angleUnits = [
   'turn'
 ];
 
+let fixedLengthUnits = [
+  'px',
+  'in',
+  'cm',
+  'mm',
+  'pt',
+  'pc'
+];
+
 let conversionFactors = {
   'deg': {
     'deg': 1,
@@ -37,6 +46,59 @@ let conversionFactors = {
     'grad': 400,
     'turn': 1,
   },
+  // 96 px per in
+  // 2.54 cm per in
+  // 10 mm per cm
+  // 72 pt per in
+  // 6 pc per in
+  'px': {
+    'px': 1,
+    'in': 1 / 96,
+    'cm': 2.54 / 96,
+    'mm': 25.4 / 96,
+    'pt': 72 / 96,
+    'pc': 6 / 96
+  },
+  'in': {
+    'px': 96,
+    'in': 1,
+    'cm': 2.54,
+    'mm': 25.4,
+    'pt': 72,
+    'pc': 6
+  },
+  'cm': {
+    'px': 96 / 2.54,
+    'in': 1 / 2.54,
+    'cm': 1,
+    'mm': 10,
+    'pt': 72 / 2.54,
+    'pc': 6 / 2.54
+  },
+  'mm': {
+    'px': 96 / 25.4,
+    'in': 1 / 25.4,
+    'cm': 1 / 10,
+    'mm': 1,
+    'pt': 72 / 25.4,
+    'pc': 6 / 25.4
+  },
+  'pt': {
+    'px': 96 / 72,
+    'in': 1 / 72,
+    'cm': 2.54 / 72,
+    'mm': 25.4 / 72,
+    'pt': 1,
+    'pc': 6 / 72,
+  },
+  'pc': {
+    'px': 96 / 6,
+    'in': 1 / 6,
+    'cm': 2.54 / 6,
+    'mm': 25.4 / 6,
+    'pt': 72 / 6,
+    'pc': 1
+  }
 }
 
 test(() => {
@@ -65,4 +127,16 @@ for (let unit of angleUnits) {
   }
 }
 
+for (let unit of fixedLengthUnits) {
+  for (let toUnit of fixedLengthUnits) {
+    test(() => {
+      let unitValue = new CSSUnitValue(1, unit);
+      let result = unitValue.to(toUnit);
+      assert_approx_equals(
+          result.value, conversionFactors[unit][toUnit], EPSILON);
+      assert_equals(result.unit, toUnit);
+    }, 'Converting fixed length unit ' + unit + ' to ' + toUnit);
+  }
+}
+
 </script>