Add the ability to search the AccessibilityObject cache

Add the ability to search the AccessibilityObject cache
https://bugs.webkit.org/show_bug.cgi?id=64994

To support searching the AccessibilityObject cache, we first need to
implement a minimal set of functions that will allow AccessibilityObjects
to be identified when searching using common search criteria. The additional
functions below complement the existing identification functionality already
available and together provide a basic working set to build search on top of.
Additionally, the blockquoteLevel function has been moved into the AccessibilityObject
class to make it available to all platforms.

Patch by Samuel White <samuel_white@apple.com> on 2011-07-29
Reviewed by Chris Fleizach.

New tests will be included in the following patch that will also implement
basic search functionality.

* accessibility/AccessibilityObject.cpp:
(WebCore::AccessibilityObject::isBlockquote):
(WebCore::AccessibilityObject::isLandmark):
(WebCore::AccessibilityObject::hasMisspelling):
(WebCore::AccessibilityObject::blockquoteLevel):
* accessibility/AccessibilityObject.h:
(WebCore::AccessibilityObject::isUnvisited):
(WebCore::AccessibilityObject::hasBoldFont):
(WebCore::AccessibilityObject::hasItalicFont):
(WebCore::AccessibilityObject::hasPlainText):
(WebCore::AccessibilityObject::hasSameFont):
(WebCore::AccessibilityObject::hasSameFontColor):
(WebCore::AccessibilityObject::hasSameStyle):
(WebCore::AccessibilityObject::hasStaticText):
(WebCore::AccessibilityObject::hasUnderline):
(WebCore::AccessibilityObject::tableLevel):
* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::isUnvisited):
(WebCore::AccessibilityRenderObject::hasBoldFont):
(WebCore::AccessibilityRenderObject::hasItalicFont):
(WebCore::AccessibilityRenderObject::hasPlainText):
(WebCore::AccessibilityRenderObject::hasSameFont):
(WebCore::AccessibilityRenderObject::hasSameFontColor):
(WebCore::AccessibilityRenderObject::hasSameStyle):
(WebCore::AccessibilityRenderObject::hasUnderline):
* accessibility/AccessibilityRenderObject.h:
* accessibility/AccessibilityTable.cpp:
(WebCore::AccessibilityTable::tableLevel):
* accessibility/AccessibilityTable.h:
* accessibility/mac/AccessibilityObjectWrapper.mm:
(AXAttributeStringSetBlockquoteLevel):
(-[AccessibilityObjectWrapper accessibilityAttributeValue:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@92000 268f45cc-cd09-0410-ab3c-d52691b4dbfc