misc: Update author information

Author information was added to any file
with the standard license text.
Authors were added that added/changed >= 3%
of the lines of a file.
diff --git a/layers/draw_state.cpp b/layers/draw_state.cpp
index 7d16f2b..d6dad7e 100644
--- a/layers/draw_state.cpp
+++ b/layers/draw_state.cpp
@@ -20,6 +20,10 @@
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Cody Northrop <cody@lunarg.com>
+ * Author: Michael Lentine <mlentine@google.com>
+ * Author: Tobin Ehlis <tobin@lunarg.com>
  */
 
 #include <stdio.h>