The change addressed followings problems.
- Recycling of gl::SharedSurface by RemoteTextureMap is not handled by gl::SwapChain.
- PrepareForUse()/NotifyNotUsed() of remote texture's TextureHost(SurfaceTextureHost) is not handled
- Wrapping of RenderAndroidSurfaceTextureHost by RenderTextureHostWrapper is not handled
PrepareForUse()/NotifyNotUsed() is called based on compositor ref count of TextureHost. Normally TextureHost is wrapped by WebRenderTextureHost, then the WebRenderTextureHost handles PrepareForUse()/NotifyNotUsed(). But in remote texture case, WebRenderTextureHost wraps RemoteTextureHostWrapper. And compositable ref of remote texture's TextureHost is updated within RemoteTextureMap::mMutex. Then PrepareForUse()/NotifyNotUsed() happen outside of WebRenderTextureHost in non compositor thread.
With pref gfx.canvas.accelerated=true, canvas renderings were broken on android emulator. The boroken rendering seemed to happen by GL of android emulator. The boroken rendering did not happen with tests on android hardware.
Differential Revision: https://phabricator.services.mozilla.com/D159261
fa5029a70f