Disable Bitmap density scaling to Picture

Bug: 76144110
Test: I95165583649a1df86782d3684f7bf9bcd8dab7bd

This matches the behavior of DisplayListCanvas. Not scaling means that
we can draw a Bitmap to a Picture, and then play that back in HW mode
and see the same result.

Change-Id: I7421431bad0531112e06ab5c14814b6b6f1591d9

graphics/java/android/graphics/Picture.java

@@ -209,6 +209,8 @@ public class Picture {
         public PictureCanvas(Picture pict, long nativeCanvas) {
             super(nativeCanvas);
             mPicture = pict;
+            // Disable bitmap density scaling. This matches DisplayListCanvas.
+            mDensity = 0;
         }
 
         @Override