Notify listeners on OffScreenCanvas changes

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

Index: third_party/WebKit/Source/platform/graphics/SkiaTextureHolder.h
diff --git a/third_party/WebKit/Source/platform/graphics/SkiaTextureHolder.h b/third_party/WebKit/Source/platform/graphics/SkiaTextureHolder.h
index 6bfdaefebf2618424bf52474e32c813691d8f541..b4da4fe20b34f441d8390095d4fdd6ca1068c9df 100644
--- a/third_party/WebKit/Source/platform/graphics/SkiaTextureHolder.h
+++ b/third_party/WebKit/Source/platform/graphics/SkiaTextureHolder.h
@@ -14,6 +14,9 @@ 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;