Implement off-screen rendering using the Ozone layer

[magreenblatt]

Original report by me.

---

Ozone is a platform abstraction layer beneath the Aura / Views window system in Chromium that is used for low level input and graphics. Support for Wayland and X11 on Linux is currently implemented using Ozone. Windows support may also be added eventually (see this issue).

By implementing CEF’s off-screen rendering using the Ozone layer we could:

• Render/composite the complete Aura/Views window hierarchy to an application-supplied hardware-accelerated surface.
• Use a Chromium API/layer specifically designed and supported for this purpose.
• Provide a “cleaner” alternative to the hardware-accelerated implementation currently proposed in issue CEF3: Support rendering to a hardware GL/D3D texture/surface provided by the client #1006.
• Add off-screen rendering support for the Chrome runtime (see issue chrome: Add support for off-screen rendering #3293)

‌

[magreenblatt]

• edited description

[magreenblatt]

• edited description