Notify listeners on OffScreenCanvas changes

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

 // Copyright 2016 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.
 
 #ifndef SkiaTextureHolder_h
 #define SkiaTextureHolder_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/TextureHolder.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT SkiaTextureHolder final : public TextureHolder {
  public:
   ~SkiaTextureHolder() override;
 
+  // Methods overriding TextureHolder
+  void updateSyncToken(gpu::SyncToken) override {}
+
   bool isSkiaTextureHolder() final { return true; }
   bool isMailboxTextureHolder() final { return false; }
   unsigned sharedContextId() final;
   IntSize size() const final {
     return IntSize(m_image->width(), m_image->height());
   }
   bool currentFrameKnownToBeOpaque(Image::MetadataMode) final {
     return m_image->isOpaque();
   }
 
@@ skipping 14 matching lines @@
 
   // The m_image should always be texture-backed
   sk_sp<SkImage> m_image;
   // Id of the shared context where m_image was created
   unsigned m_sharedContextId = 0;
 };
 
 }  // namespace blink
 
 #endif  // SkiaTextureHolder_h