Fixed bug with SkImage leaving canvas backing store in an immutable state after destroy.

src/image/SkImage_Raster.cpp

Index: src/image/SkImage_Raster.cpp
===================================================================
--- src/image/SkImage_Raster.cpp	(revision 8437)
+++ src/image/SkImage_Raster.cpp	(working copy)
@@ -100,7 +100,6 @@
     fBitmap.setConfig(config, info.fWidth, info.fHeight, rowBytes);
     fBitmap.setPixelRef(pr);
     fBitmap.setIsOpaque(isOpaque);
-    fBitmap.setImmutable();

[Justin Novosad, 2013/04/03 14:10:54]

Problem here is that the pixel ref is shared with the surface's device. If the
SkImage is released before a copy on write occurs, the surface will be left in
an unwritable state.

 }
 
 SkImage_Raster::~SkImage_Raster() {}