[chromium] Allow implicit conversion between gfx::Vector2d and WebSize
https://bugs.webkit.org/show_bug.cgi?id=100553

Reviewed by James Robinson.

The gfx::Vector2d class is used in chromium for defining distances. The
IntSize class is used equivalently inside WebCore. This lets us convert
between vectors and sizes along the API boundary.

* chromium/public/WebSize.h:
(WebKit::WebSize::WebSize):
(WebSize):
(WebKit::WebSize::operator=):
(WebKit::WebSize::operator gfx::Vector2d):


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@133198 268f45cc-cd09-0410-ab3c-d52691b4dbfc