Do not dispatch 'change' events during pressing spin buttons for input[type=number].

Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp

Index: Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
diff --git a/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp b/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
index 4db59238bf0e1516fd5de778192d4436e7475102..58e7a09498600fd2056ea1ac2fef570c26157ace 100644
--- a/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
+++ b/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
@@ -240,6 +240,12 @@ void BaseMultipleFieldsDateAndTimeInputType::spinButtonStepUp()
         edit->stepUp();
 }
 
+void BaseMultipleFieldsDateAndTimeInputType::spinButtonDidReleaseMouseCapture()
+{
+    if (element().focused())

[tkent, 2014/03/18 08:26:20]

Why is this check needed?

We should dispatch two change events in the following scenario:
 - Mousedown on a spin button
   INPUT gets focus
 - The INPUT looses focus for some reasons.
   The first 'change' event should be dispatched.
 - Mouseup on a spin button
  The second 'change' event should be dispatch if the value is changed.

[Habib Virji, 2014/03/18 17:37:27]

It is needed since releaseCapture is called from detach, resulting in change
event dispatch.   This is to just make sure dispatch event only when in focus. 

Added condition in SpinButton to dispatch a change event in case of mouseDown
and also if mouseout occurs after being in focus. 

On 2014/03/18 08:26:20, tkent wrote:

[tkent, 2014/03/31 07:50:39]

I see.  We should not dispatch any events in detach().
However, if the value of an INPUT element was changed, we have to dispatch a
'change' event.  Hmm we should change the behavior so that we release mouse
capturing when the host INPUT element looses focus.

+        element().dispatchFormControlChangeEvent();
+}
+
 bool BaseMultipleFieldsDateAndTimeInputType::isPickerIndicatorOwnerDisabledOrReadOnly() const
 {
     return element().isDisabledOrReadOnly();