Merge 141252

Merge 141252

BUG=163887
> [Chromium] Fix find in page rects for overflowing content.
> https://bugs.webkit.org/show_bug.cgi?id=104924
> 
> Reviewed by Julien Chaffraix.
> 
> If a div has overflowing content, we should only normalise its
> coordinates against the renderview or the containing scrollable block.
> 
> TEST=WebFrameTest.FindInPageMatchRects
> 
> * src/FindInPageCoordinates.cpp:
> (WebKit::enclosingScrollableAncestor):
>     Helper function to find the enclosing containing block with an overflow clip.
> (WebKit::toNormalizedRect):
>     Pass in the container as an argument.
> (WebKit::findInPageRectFromAbsoluteRect):
>     Compute the container for toNormalizedRect using enclosingScrollableAncestor.
> * tests/WebFrameTest.cpp:
>     Add expectations for new tests in WebFrameTest::FindInPageMatchRects and WebFrameTest::FindInPage.
> * tests/data/find.html:
>     Add test case for <select> element.
> * tests/data/find_in_page_frame.html:
>     Add test cases:
>       - Result 15, 16 tests that containing <div> with style float:left and
>         height:0px does not impact coordinate normalization.
>       - Result 17, 18 tests that matches with absolute positioning are normalized containing
>         relative positioned block, even if there is a closer parent block with overflow clip.
>       - Result 19 adds a test case for <select> element.
> 

TBR=jknotten@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=141279