Fix SkPixelXorXfermode serialization bug

src/effects/SkPixelXorXfermode.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPixelXorXfermode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkString.h"
 
 // we always return an opaque color, 'cause I don't know what to do with
 // the alpha-component and still return a valid premultiplied color.
 SkPMColor SkPixelXorXfermode::xferColor(SkPMColor src, SkPMColor dst) const {
     SkPMColor res = src ^ dst ^ fOpColor;
 
     res |= (SK_A32_MASK << SK_A32_SHIFT);   // force it to be opaque
     return res;
 }
 
 void SkPixelXorXfermode::flatten(SkWriteBuffer& wb) const {
-    wb.writeColor(fOpColor);
+    wb.writeColor(SkColorSetRGB(SkGetPackedR32(fOpColor),
+                                SkGetPackedG32(fOpColor),
+                                SkGetPackedB32(fOpColor)));
 }
 
 SkFlattenable* SkPixelXorXfermode::CreateProc(SkReadBuffer& buffer) {
     return Create(buffer.readColor());
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkPixelXorXfermode::toString(SkString* str) const {
     str->append("SkPixelXorXfermode: ");
     str->appendHex(fOpColor);
@@ skipping 344 matching lines @@
 }
 
 bool SkPixelXorXfermode::asXPFactory(GrXPFactory** xpf) const {
     if (xpf) {
         *xpf = GrPixelXorXPFactory::Create(fOpColor);
     }
     return true;
 }
 
 #endif