[unity] Allow SkeletonGraphic runtime atlas.

spine-unity/Assets/spine-unity/Modules/SkeletonGraphic/SkeletonGraphic.cs

@@ -28,36 +28,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
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 #if (UNITY_5_0 || UNITY_5_1 || UNITY_4_0 || UNITY_4_1 || UNITY_4_2 || UNITY_4_3 || UNITY_4_4 || UNITY_4_5 || UNITY_4_6 || UNITY_4_7)
 #define PREUNITY_5_2
 #endif
@@ -127,9 +97,11 @@ namespace Spine.Unity {
 		#if !PREUNITY_5_2
 		#region Internals
 		// This is used by the UI system to determine what to put in the MaterialPropertyBlock.
+		public Texture OverrideTexture { get; set; }
 		public override Texture mainTexture {
 			get { 
 				// Fail loudly when incorrectly set up.
+				if (OverrideTexture != null) return OverrideTexture;
 				return skeletonDataAsset == null ? null : skeletonDataAsset.atlasAssets[0].materials[0].mainTexture;
 			}
 		}