Add more unit tests for ImageResource's DecodeError

third_party/WebKit/Source/core/loader/resource/MockImageResourceObserver.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 MockImageResourceObserver_h
 #define MockImageResourceObserver_h
 
 #include "core/loader/resource/ImageResource.h"
 #include "core/loader/resource/ImageResourceContent.h"
 #include "core/loader/resource/ImageResourceObserver.h"
+#include "platform/loader/fetch/ResourceStatus.h"
 #include <memory>
 
 namespace blink {
 
 class MockImageResourceObserver final : public ImageResourceObserver {
  public:
   static std::unique_ptr<MockImageResourceObserver> create(
       ImageResourceContent* content) {
     return WTF::wrapUnique(new MockImageResourceObserver(content));
   }
   ~MockImageResourceObserver() override;
 
   void removeAsObserver();
 
   int imageChangedCount() const { return m_imageChangedCount; }
   bool imageNotifyFinishedCalled() const;
 
   int imageWidthOnLastImageChanged() const {
     return m_imageWidthOnLastImageChanged;
   }
   int imageWidthOnImageNotifyFinished() const {
     return m_imageWidthOnImageNotifyFinished;
   }
+  ResourceStatus statusOnImageNotifyFinished() const {
+    return m_statusOnImageNotifyFinished;
+  }
 
  private:
   explicit MockImageResourceObserver(ImageResourceContent*);
 
   // ImageResourceObserver overrides.
   void imageNotifyFinished(ImageResourceContent*) override;
   void imageChanged(ImageResourceContent*, const IntRect*) override;
   String debugName() const override { return "MockImageResourceObserver"; }
 
   Persistent<ImageResourceContent> m_content;
   int m_imageChangedCount;
   int m_imageWidthOnLastImageChanged;
   int m_imageNotifyFinishedCount;
   int m_imageWidthOnImageNotifyFinished;
+  ResourceStatus m_statusOnImageNotifyFinished = ResourceStatus::NotStarted;
 };
 
 }  // namespace blink
 
 #endif  // MockImageResourceObserver_h