Add initial draft of EGL_ANDROID_GLES_layers.txt

This extension is just an indicator of GLES layers support,
does not expose any new tokens or entrypoints.

Bug: 110883880
Test: atest CtsGpuToolsHostTestCases
Test: Connect with GLES layers using GAPID and RenderDoc
Change-Id: I898d7980826ab0fe5afaa0b2dbe7d93f29b3f88f
1 file changed