[chromium] Add the GL_CHROMIUM_lose_context to WebGraphicsContext3D https://bugs.webkit.org/show_bug.cgi?id=105238 Reviewed by James Robinson. * chromium/public/WebGraphicsContext3D.h: (WebGraphicsContext3D): (WebKit::WebGraphicsContext3D::loseContext): git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@137970 268f45cc-cd09-0410-ab3c-d52691b4dbfc