Phase III Step 1: Make ImageResourceContent manage its own ResourceStatus

third_party/WebKit/Source/core/loader/resource/MockImageResourceObserver.cpp

 // 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.
 
 #include "core/loader/resource/MockImageResourceObserver.h"
 
 #include "core/loader/resource/ImageResource.h"
 #include "core/loader/resource/ImageResourceContent.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 23 matching lines @@
 void MockImageResourceObserver::imageChanged(ImageResourceContent* image,
                                              const IntRect*) {
   m_imageChangedCount++;
   m_imageWidthOnLastImageChanged =
       m_content->hasImage() ? m_content->getImage()->width() : 0;
 }
 
 void MockImageResourceObserver::imageNotifyFinished(
     ImageResourceContent* image) {
   ASSERT_EQ(0, m_imageNotifyFinishedCount);
+  DCHECK(image->isLoaded());

[hiroshige, 2017/03/15 00:22:58]

This CL enables this DCHECK().
(Previously this fails on successful loads)

   m_imageNotifyFinishedCount++;
   m_imageWidthOnImageNotifyFinished =
       m_content->hasImage() ? m_content->getImage()->width() : 0;
   m_statusOnImageNotifyFinished = m_content->getStatus();
 }
 
 bool MockImageResourceObserver::imageNotifyFinishedCalled() const {
   DCHECK_LE(m_imageNotifyFinishedCount, 1);
   return m_imageNotifyFinishedCount;
 }
 
 }  // namespace blink