Use libANGLE to reduce duplicated ANGLE source compiles. libGLESv2_static and libGLESv2 can re-use the same object files. BUG=angle:733 Change-Id: I894f4b5b6fbc1fc47812609d9e996691daf9f318 Reviewed-on: https://chromium-review.googlesource.com/214188 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>