Merge 122224 - Input type=range issue with events not being raised when value set in js

Merge 122224 - Input type=range issue with events not being raised when value set in js
https://bugs.webkit.org/show_bug.cgi?id=84674

Source/WebCore:

Fix dispatching of change and click events for the input slider.
Prior to the fix, change events were not fired if the new value
matched the value at last change notification based on expected
behavior for text fields.  Clicks were not fired if the thumb
element was repositioned under the cursor on mouse down.

Patch by Kevin Ellis <kevers@chromium.org>; on 2012-07-10
Reviewed by Kent Tamura.

Tests: fast/events/click-range-slider.html
       fast/events/onchange-range-slider.html

* html/shadow/SliderThumbElement.cpp:
(WebCore::SliderThumbElement::setPositionFromPoint):
* page/EventHandler.cpp:
(WebCore::EventHandler::handleMouseReleaseEvent):

LayoutTests:

Ensure that click and change events are properly triggered for range
sliders.  Prior to the fix, change events were not fired if the new
value matched the value at last change notification based on expected
behavior for text fields.  Clicks were not fired if the thumb element
was positioned under the cursor on mouse down.

Patch by Kevin Ellis <kevers@chromium.org>; on 2012-07-10
Reviewed by Kent Tamura.

* fast/events/click-range-slider-expected.txt: Added.
* fast/events/click-range-slider.html: Added.
* fast/events/onchange-range-slider-expected.txt: Added.
* fast/events/onchange-range-slider.html: Added.

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=122865