FrameHandle
This design document is out of date.
Blink Frames are now implemented using an inheritance relationship, where blink::Frame is a base class for blink::LocalFrame and blink::RemoteFrame. They are now fully implemented so this documentation will not be updated.
Doc: https://docs.google.com/a/chromium.org/document/edit?id=1PeSpryRsXlLxHU58GOa0s67kuKaQeGitmM0iWS02CvU
FrameHandle
Diagram: https://docs.google.com/a/chromium.org/drawings/d/1sqOb8DCNy7wlPMCp9oPyd981wBsYfvy4SsRZD4_HYos/view