https://bugs.webkit.org/show_bug.cgi?id=56298

Reviewed by NOBODY (OOPS!).

Source/WebCore:

An inner-spin-button is put on the right border and ignores right
padding in RenderTextControlSingleLine::layout(), but forwardEvent()
checks if a point is in an area just right of an internal text block.
This inconsistency caused a bug that an inner-spin-button with large
padding didn't receive mouse events.

To fix this bug, we render spin buttons as layers, and remove manual
event forwarding code.

Test: fast/forms/input-number-large-padding.html

* css/html.css: Add "position:relative" to make a spin-button a layer.
(input::-webkit-inner-spin-button):
(input::-webkit-outer-spin-button):
* rendering/RenderTextControlSingleLine.cpp:
(WebCore::RenderTextControlSingleLine::forwardEvent):
  Remove manual event forwarding code.

LayoutTests:

Add a test, and skip on platforms which has no inner-spin-button implementation.

* fast/forms/input-number-large-padding-expected.txt: Added.
* fast/forms/input-number-large-padding.html: Added.
* platform/chromium/test_expectations.txt:
* platform/mac/Skipped:
* platform/mac/fast/forms/input-appearance-spinbutton-disabled-readonly-expected.txt:
* platform/mac/fast/forms/input-appearance-spinbutton-expected.txt:
* platform/mac/fast/forms/input-appearance-spinbutton-layer-expected.txt:
* platform/mac/fast/forms/input-appearance-spinbutton-up-expected.txt:
* platform/mac/fast/forms/input-appearance-spinbutton-visibility-expected.txt:
* platform/qt/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@83145 268f45cc-cd09-0410-ab3c-d52691b4dbfc