Mark drawbitmaprect's large bitmaps as immutable.

gm/drawbitmaprect.cpp

Index: gm/drawbitmaprect.cpp
diff --git a/gm/drawbitmaprect.cpp b/gm/drawbitmaprect.cpp
index bc7e0359ed349797a8565b9e62b26ec7100846ee..20e74e5928d5cff2bc0be88462b546bb824e2a80 100644
--- a/gm/drawbitmaprect.cpp
+++ b/gm/drawbitmaprect.cpp
@@ -68,6 +68,7 @@ static void makebm(SkBitmap* bm, int w, int h) {
         rect.inset(wScalar / 8, hScalar / 8);
         mat.postScale(SK_Scalar1 / 4, SK_Scalar1 / 4);
     }
+    bm->setImmutable();

[reed1, 2014/05/02 14:11:00]

// mark as immutable to be nicer to backends, so they won't have to deep-copy
it.

[mtklein, 2014/05/02 14:14:00]

Done.

 }
 
 static const int gSize = 1024;