doesn't set the selection for <input> and <textarea>
https://bugs.webkit.org/show_bug.cgi?id=77186

Reviewed by Hajime Morita.

When the find-in-page box is closed, WebFrame::stopFinding(false) is
called. It calls setFindEndstateFocusAndSelection(). Before r87067,
m_activeMatch was stored as the normal selection in <input> or
<textarea> by accident. r87067 stopped this accidental behavior.

However the behavior of pre-r87067 is useful and we should support it
for contentEditable elements too.

* src/WebFrameImpl.cpp:
(WebKit::WebFrameImpl::setFindEndstateFocusAndSelection):
- Add special handing for <input> and <textarea> to find a focusable parent.
- Sets the active match as the selection even if a focusable parent is found.
* tests/WebFrameTest.cpp:
(WebKit::TEST_F): Add tests for find() and stopFinding().
* tests/data/find.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106216 268f45cc-cd09-0410-ab3c-d52691b4dbfc