Fix the linear-rgb canvas color space so that it renders

third_party/WebKit/Source/platform/graphics/UnacceleratedImageBufferSurface.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 class PLATFORM_EXPORT UnacceleratedImageBufferSurface
     : public ImageBufferSurface {
   WTF_MAKE_NONCOPYABLE(UnacceleratedImageBufferSurface);
   USING_FAST_MALLOC(UnacceleratedImageBufferSurface);
 
  public:
   UnacceleratedImageBufferSurface(
       const IntSize&,
       OpacityMode = NonOpaque,
       ImageInitializationMode = InitializeImagePixels,
-      sk_sp<SkColorSpace> = nullptr);
+      sk_sp<SkColorSpace> = nullptr,
+      SkColorType = kN32_SkColorType);
   ~UnacceleratedImageBufferSurface() override;
 
   SkCanvas* canvas() override;
   bool isValid() const override;
 
   sk_sp<SkImage> newImageSnapshot(AccelerationHint, SnapshotReason) override;
 
  private:
   sk_sp<SkSurface> m_surface;
 };
 
 }  // namespace blink
 
 #endif