[chromium] Add implicit conversions between WebFloatPoint and gfx::PointF
https://bugs.webkit.org/show_bug.cgi?id=100435

Reviewed by James Robinson.

This is similar to other Web geometry types, but the WebFloatPoint is
missing it.

* chromium/public/WebFloatPoint.h:
(WebFloatPoint):
(WebKit::WebFloatPoint::WebFloatPoint):
(WebKit::WebFloatPoint::operator=):
(WebKit::WebFloatPoint::operator gfx::PointF):


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@132683 268f45cc-cd09-0410-ab3c-d52691b4dbfc