Derive the step base for an input element as (now) specified.

Source/core/html/forms/InputType.cpp

Index: Source/core/html/forms/InputType.cpp
diff --git a/Source/core/html/forms/InputType.cpp b/Source/core/html/forms/InputType.cpp
index eabbbe9bae142ddff80eb2a1dc308f3b82bef93d..65ba6ea43779d26aa19026c89f694211d05cb3e0 100644
--- a/Source/core/html/forms/InputType.cpp
+++ b/Source/core/html/forms/InputType.cpp
@@ -985,4 +985,12 @@ void InputType::countUsageIfVisible(UseCounter::Feature feature) const
     }
 }
 
+Decimal InputType::findStepBase(const Decimal& defaultValue) const

[yosin_UTC9, 2013/11/27 01:28:05]

The word "find" leads me the function has loop. How about "calculateStepBase()"
or better?

+{
+    Decimal stepBase = parseToNumber(element().fastGetAttribute(minAttr), Decimal::nan());

[yosin_UTC9, 2013/11/27 01:28:05]

nit: const Decimal stepBase = ...;

+    if (!stepBase.isFinite())
+        stepBase = parseToNumber(element().fastGetAttribute(valueAttr), defaultValue);

[yosin_UTC9, 2013/11/27 01:28:05]

nit: rather than copying, just |return parseToNumber(...);|

+    return stepBase;
+}
+
 } // namespace WebCore