IDL: Add toRestricted{Float,Double}() helpers to V8Binding.h

Source/bindings/core/v8/V8Binding.cpp

Index: Source/bindings/core/v8/V8Binding.cpp
diff --git a/Source/bindings/core/v8/V8Binding.cpp b/Source/bindings/core/v8/V8Binding.cpp
index 866ef4f527700fb9958e424ac46f1d93eff70408..712c6454a3202caab6b5123db75a49d3c3f85b2b 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -519,6 +519,18 @@ float toFloat(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
     return static_cast<float>(toDouble(value, exceptionState));
 }
 
+float toRestrictedFloat(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
+{
+    float numberValue = toFloat(value, exceptionState);
+    if (exceptionState.hadException())
+        return 0;
+    if (!std::isfinite(numberValue)) {
+        exceptionState.throwTypeError("The provided float value is non-finite.");
+        return 0;
+    }
+    return numberValue;
+}
+
 double toDouble(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     if (value->IsNumber())
@@ -534,6 +546,18 @@ double toDouble(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
     return numberObject->NumberValue();
 }
 
+double toRestrictedDouble(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
+{
+    double numberValue = toDouble(value, exceptionState);
+    if (exceptionState.hadException())
+        return 0;
+    if (!std::isfinite(numberValue)) {
+        exceptionState.throwTypeError("The provided double value is non-finite.");
+        return 0;
+    }
+    return numberValue;
+}
+
 String toByteString(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     // Handle null default value.