[Forms] Multiple fields datetime/datetime-local input UI
https://bugs.webkit.org/show_bug.cgi?id=97997

Reviewed by Kent Tamura.

Source/WebCore:

This patch introduces multiple fields "datetime" and "datetime-local"
input UI in DRT. We'll enable these features once we add tests.

No new tests. To reduce size of this patch, other patches add tests
for multiple fields datetime/datetime-local input UI.

Note: Actual outputs of four tests
  - fast/forms/datetime/datetime-input-visible-string.html
  - fast/forms/datetime/datetime-stepup-stepdown-from-renderer.html
  - fast/forms/datetimelocal/datetimelocal-input-visible-string.html
  - fast/forms/datetimelocal/datetimelocal-stepup-stepdown-from-renderer.html
are different.

* bindings/generic/RuntimeEnabledFeatures.cpp:
(WebCore):
* css/html.css:
(input::-webkit-datetime-edit-day-field): Added for field appearance.
(input::-webkit-datetime-edit-day-field:focus):  Added to remove focus ring.
* html/DateTimeInputType.cpp:
(WebCore::DateTimeInputType::formatDateTimeFieldsState): Added to format numeric value to string value as specified in HTML5 specification.
(WebCore::DateTimeInputType::setupLayoutParameters): Added to set layout of multiple fields.
* html/DateTimeInputType.h: Changed to include BaseMultipleFieldsDateAndTimeInputType.h and introduce BaseDateTimeInputType typedef.
(WebCore::DateTimeInputType::DateTimeInputType): Changed base class name to BaseDateTimeInputType.
(DateTimeInputType): Changed to add declarations for formatDateTimeFieldsState() and setupLayoutParameters().
* html/DateTimeLocalInputType.cpp:
(WebCore::DateTimeLocalInputType::formatDateTimeFieldsState): Added to format numeric value to string value as specified in HTML5 specification.
(WebCore::DateTimeLocalInputType::setupLayoutParameters):  Added to set layout of multiple fields.
* html/DateTimeLocalInputType.h: Changed to include BaseMultipleFieldsDateAndTimeInputType.h and introduce BaseDateTimeLocalInputType typedef.
(WebCore::DateTimeLocalInputType::DateTimeLocalInputType): Changed base class name to BaseDateTimeLocalInputType.
(DateTimeLocalInputType): Changed to add declarations for formatDateTimeFieldsState() and setupLayoutParameters().
* html/shadow/DateTimeEditElement.cpp:
(DateTimeEditBuilder): Changed to add member variable m_placeholderForDay.
(WebCore::DateTimeEditBuilder::DateTimeEditBuilder): Changed to initialize m_placeholderForDay.
(WebCore::DateTimeEditBuilder::visitField): Changed to support week field.
* html/shadow/DateTimeEditElement.h:
(LayoutParameters): Changed to add placeholderForDay member variable.

LayoutTests:

This patch adds Chromium port specific expectations for "datetime" and
"datetime-local" input type tests for multiple fields datetime input UI.

* platform/chromium/fast/forms/datetime/datetime-input-visible-string-expected.txt: Added. Multiple fields datetime input UI doesn't have selection.
* platform/chromium/fast/forms/datetime/datetime-stepup-stepdown-from-renderer-expected.txt: Added. On multiple fields datetime input UI, step down/up decrement/increment a field rather than whole value.
* platform/chromium/fast/forms/datetimelocal/datetimelocal-input-visible-string-expected.txt: Added. Multiple fields datetime-local input UI doesn't have selection.
* platform/chromium/fast/forms/datetimelocal/datetimelocal-stepup-stepdown-from-renderer-expected.txt: Added. On multiple fields datetime-local input UI, step down/up decrement/increment a field rather than whole value.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk/LayoutTests@130147 268f45cc-cd09-0410-ab3c-d52691b4dbfc