Update unit tests after SkFlattenable::getFactory const-ification.

cc/test/skia_common.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/skia_common.h"
 
 #include "cc/resources/picture.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkBitmapDevice.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 TestPixelRef::TestPixelRef(int width, int height)
     : pixels_(new char[4 * width * height]) {}
 
 TestPixelRef::~TestPixelRef() {}
 
-SkFlattenable::Factory TestPixelRef::getFactory() { return NULL; }
+SkFlattenable::Factory TestPixelRef::getFactory() const { return NULL; }
 
 void* TestPixelRef::onLockPixels(SkColorTable** color_table) {
   return pixels_.get();
 }
 
 SkPixelRef* TestPixelRef::deepCopy(
     SkBitmap::Config config,
     const SkIRect* subset) {
   this->ref();
   return this;
 }
 
 
 TestLazyPixelRef::TestLazyPixelRef(int width, int height)
     : pixels_(new char[4 * width * height]) {}
 
 TestLazyPixelRef::~TestLazyPixelRef() {}
 
-SkFlattenable::Factory TestLazyPixelRef::getFactory() { return NULL; }
+SkFlattenable::Factory TestLazyPixelRef::getFactory() const { return NULL; }
 
 void* TestLazyPixelRef::onLockPixels(SkColorTable** color_table) {
   return pixels_.get();
 }
 
 bool TestLazyPixelRef::PrepareToDecode(const PrepareParams& params) {
   return true;
 }
 
 bool TestLazyPixelRef::MaybeDecoded() {
@@ skipping 27 matching lines @@
   lazy_pixel_ref->setURI(uri);
 
   bitmap->setConfig(SkBitmap::kARGB_8888_Config,
                     size.width(),
                     size.height());
   bitmap->setPixelRef(lazy_pixel_ref.get());
 }
 
 
 }  // namespace cc