Spinner elements not to dispatch change event on hover

Source/core/html/shadow/SpinButtonElement.cpp

Index: Source/core/html/shadow/SpinButtonElement.cpp
diff --git a/Source/core/html/shadow/SpinButtonElement.cpp b/Source/core/html/shadow/SpinButtonElement.cpp
index 04e21b86af6f1ea332e91be804b0b1b0519bbc43..8f0b87dfa31b1064ad860f1753befad9ebdf61e3 100644
--- a/Source/core/html/shadow/SpinButtonElement.cpp
+++ b/Source/core/html/shadow/SpinButtonElement.cpp
@@ -47,6 +47,7 @@ inline SpinButtonElement::SpinButtonElement(Document& document, SpinButtonOwner&
     : HTMLDivElement(document)
     , m_spinButtonOwner(&spinButtonOwner)
     , m_capturing(false)
+    , m_mouseEvent(false)
     , m_upDownState(Indeterminate)
     , m_pressStartingState(Indeterminate)
     , m_repeatingTimer(this, &SpinButtonElement::repeatingTimerFired)
@@ -111,8 +112,10 @@ void SpinButtonElement::defaultEventHandler(Event* event)
             }
             event->setDefaultHandled();
         }
+        m_mouseEvent = true;
     } else if (mouseEvent->type() == EventTypeNames::mouseup && mouseEvent->button() == LeftButton) {
         releaseCapture();
+        m_mouseEvent = true;
     } else if (event->type() == EventTypeNames::mousemove) {
         if (box->pixelSnappedBorderBoxRect().contains(local)) {
             if (!m_capturing) {
@@ -131,6 +134,7 @@ void SpinButtonElement::defaultEventHandler(Event* event)
             releaseCapture();
             m_upDownState = Indeterminate;
         }
+        m_mouseEvent = true;

[tkent, 2014/02/04 04:57:34]

This approach doesn't work for hovering case.
1. When the pointer moves on the spin button, capturing starts, and m_mouseEvent
 is set to true.
2. When the pointer moves out from the spin button, releaseCapture() is called
with m_mouseEvent==true.

     }
 
     if (!event->defaultHandled())
@@ -198,8 +202,10 @@ void SpinButtonElement::releaseCapture()
             if (Page* page = document().page())
                 page->chrome().unregisterPopupOpeningObserver(this);
         }
-        if (m_spinButtonOwner)
-            m_spinButtonOwner->spinButtonDidReleaseMouseCapture();
+    }
+    if (m_spinButtonOwner && m_mouseEvent) {
+        m_spinButtonOwner->spinButtonDidReleaseMouseCapture();
+        m_mouseEvent = false;
     }
 }