Inline RenderLayerCompositor::canRender3DTransforms

This function is the same as RenderLayerCompositor::hasAcceleratedCompositing.

Review URL: https://codereview.chromium.org/265393002

git-svn-id: svn://svn.chromium.org/blink/trunk@173345 bbb929c8-8fbe-4397-9dbb-9b2b20218538