input[type=number] UI should reject invalid characters.

Source/core/html/forms/NumberInputType.cpp

Index: Source/core/html/forms/NumberInputType.cpp
diff --git a/Source/core/html/forms/NumberInputType.cpp b/Source/core/html/forms/NumberInputType.cpp
index 6795eb2afdadb6f28da3a8b347cbc6aa90f1c77c..7ceeda8c8394e11f464da0041c41edee3245450e 100644
--- a/Source/core/html/forms/NumberInputType.cpp
+++ b/Source/core/html/forms/NumberInputType.cpp
@@ -36,6 +36,7 @@
 #include "core/HTMLNames.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/events/BeforeTextInsertedEvent.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/ScopedEventQueue.h"
 #include "core/html/HTMLInputElement.h"
@@ -188,6 +189,11 @@ void NumberInputType::handleKeydownEvent(KeyboardEvent* event)
         TextFieldInputType::handleKeydownEvent(event);
 }
 
+void NumberInputType::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent* event)
+{
+    event->setText(locale().stripInvalidNumberCharacters(event->text(), "0123456789.Ee-+"));
+}
+
 Decimal NumberInputType::parseToNumber(const String& src, const Decimal& defaultValue) const
 {
     return parseToDecimalForNumberType(src, defaultValue);