When AC flag is turned on, the only evas engine that is currently supported is opengl_x11. This has to be passed to ecore_evas_new when creating an inspector window. Patch is coming.
Created attachment 170265 [details] Patch When ACCELERATED_COMPOSITING flag is turned on, and using X11, pass "opengl_x11" engine name to ecore_evas_new when creating a web inspector window. It is guaranteed to be available, because we wouldn't be able to create a main window if it wasn't.
Comment on attachment 170265 [details] Patch Clearing flags on attachment: 170265 Committed r132329: <http://trac.webkit.org/changeset/132329>
All reviewed patches have been landed. Closing bug.