CameraPrviewSurfaceTexture: Basic transparent activity

Signed-off-by: Wayne Wolf <wayne ron wu ## gmail>
Merge branch 'master' of https://github.com/waynewolf/garage
CameraPreviewSurfaceTexutre: small camera window embedded

Signed-off-by: Wayne Wolf <wayne ron wu ## gmail>
CameraPrviewSurfaceTexture: change texture view size to enlarge the issue

Signed-off-by: Wayne Wolf <wayne ron wu ## gmail>
CameraPrviewSurfaceTexture: move texture view inside main frame layout

Signed-off-by: Wayne Wolf <wayne ron wu ## gmail>
CameraPrviewSurfaceTexture: code clean up, hook onPreviewFrame callback

Signed-off-by: Wayne Wolf <wayne ron wu ## gmail>