Conditionally support EGL_OPENGL_API Advertize support for EGL_OPENGL_API only if angle_enable_gl_desktop_frontend is enabled. Bug: b/322142833 Tests: EGLQueryContextTest.DesktopGlApi* Change-Id: I680ea985e45e793d92fc087d21f38fd5d38f0241 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5369641 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: mohan maiya <m.maiya@samsung.com>