When launching a web application, a layer with id 1001 is created, containing the surface that belongs to the webapp, but the layer is invisible:

layer 1001 (0x3e9)
{{ ---------------------------------------}}
{{ - destination region: x=0, y=0, w=1080, h=1920}}
{{ - source region: x=0, y=0, w=1080, h=1920}}
{{ - opacity: 1}}
{{ - visibility: 0}}
{{ - surface render order: 925(0x39d), }}
{{ - on screen: 0(0x0)}}surface 925 (0x39d)
{{ ---------------------------------------}}
{{ - created by pid: 376}}
{{ - original size: x=1920, y=1080}}
{{ - destination region: x=0, y=0, w=1920, h=1080}}
{{ - source region: x=0, y=0, w=1920, h=1080}}
{{ - opacity: 1}}
{{ - visibility: 1}}
{{ - frame counter: 2}}
{{ - on layer: 1001(0x3e9)}}

Unfortunately, when setting the visibility manually, we see the surface size is not correct:

Build Configuration:
BB_VERSION = "1.36.0"
BUILD_SYS = "x86_64-linux"
NATIVELSBSTRING = "debian-9"
TARGET_SYS = "x86_64-agl-linux"
MACHINE = "intel-corei7-64"
DISTRO = "poky-agl"
DISTRO_VERSION = "6.99.4+snapshot-20190130"
TUNE_FEATURES = "m64 corei7"
TARGET_FPU = ""
meta-intel = "HEAD:718bb384942675437c081f6795da7f421da1fee6"
meta-qt5 = "HEAD:d8b531530fa42b59aa0a5b123d87a30d749cbcc4"
{{meta-agl-profile-graphical-qt5 }}
{{meta-agl-profile-graphical }}
meta-netboot = "HEAD:7b4e37d90443289af92c1312c8ccdec8c8b755ff"
{{meta-html5-framework }}
{{meta-hmi-framework }}
meta-audio-4a-framework = "bump-chromium-wam:a41ef83026c8f3ccbe901b92e021e24287f565c6"
meta-agl-demo = "HEAD:220104e57bdebd2d8e1b71c19c6f961fc9187a57"
{{meta-oe }}
{{meta-multimedia }}
{{meta-networking }}
{{meta-python }}
meta-filesystems = "HEAD:eae996301d9c097bcbeb8046f08041dc82bb62f8"
{{meta-agl-profile-core }}
{{meta-agl-distro }}
meta-agl-bsp = "HEAD:7b4e37d90443289af92c1312c8ccdec8c8b755ff"
meta-security = "HEAD:8f6969a775fa6afbf553e72ba83e71197780b2d8"
meta-perl = "HEAD:eae996301d9c097bcbeb8046f08041dc82bb62f8"
{{meta-security }}
meta-app-framework = "HEAD:7b4e37d90443289af92c1312c8ccdec8c8b755ff"
{{meta }}
meta-poky = "HEAD:68a612b7d31d270348ef5439d7f779c309bdb6ec"