Add support for transformations.

This change adds partial support for the following transforms:
- scale()
- translate()
- rotate()
- setMatrix()
- getMatrix()

The transform is stored in a snapshot and saved/restored as needed.
The transform is currently not applied to the clip rect and is not
mapped to the vertex shader.

Change-Id: Id48993453311200804149917d0c126a4d0471226

graphics/java/android/graphics/Matrix.java

@@ -37,7 +37,10 @@ public class Matrix {
     public static final int MPERSP_1 = 7;   //!< use with getValues/setValues
     public static final int MPERSP_2 = 8;   //!< use with getValues/setValues
 
-    /* package */ int native_instance;
+    /**
+     * @hide
+     */
+    public int native_instance;
 
     /**
      * Create an identity matrix