Add support for linear gradients.

Change-Id: Id15329da065045b3f06fdaed615f33cd57608496
diff --git a/libs/hwui/Program.h b/libs/hwui/Program.h
index d7970d9..18a8e92 100644
--- a/libs/hwui/Program.h
+++ b/libs/hwui/Program.h
@@ -213,6 +213,17 @@
     virtual void remove();
 
     /**
+     * Name of the matrix used to compute the screen space coordinates
+     * of the vertices.
+     */
+    int screenSpace;
+
+    /**
+     * Name of the linear gradient start point.
+     */
+    int start;
+
+    /**
      * Name of the linear gradient vector.
      */
     int gradient;