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diff --git a/chromium/third_party/blink/renderer/platform/loader/fetch/resource_finish_observer.h b/chromium/third_party/blink/renderer/platform/loader/fetch/resource_finish_observer.h
new file mode 100644
index 00000000000..72cfbda8334
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+++ b/chromium/third_party/blink/renderer/platform/loader/fetch/resource_finish_observer.h
@@ -0,0 +1,38 @@
+// Copyright 2017 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_
+
+#include "third_party/blink/renderer/platform/heap/handle.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
+
+namespace blink {
+
+// ResourceFinishObserver is different from ResourceClient in several ways.
+//  - NotifyFinished is dispatched asynchronously.
+//  - ResourceFinishObservers will be removed from Resource when the load
+//  finishes. - This class is not intended to be "subclassed" per each Resource
+//  subclass.
+//    There is no ImageResourceFinishObserver, for example.
+// ResourceFinishObserver should be quite simple. All notifications must be
+// notified AFTER the loading finishes.
+class PLATFORM_EXPORT ResourceFinishObserver : public GarbageCollectedMixin {
+ public:
+  virtual ~ResourceFinishObserver() = default;
+
+  // Called asynchronously when loading finishes.
+  // Note that this can be dispatched after removing |this| client from a
+  // Resource, because of the asynchronicity.
+  virtual void NotifyFinished() = 0;
+  // Name for debugging
+  virtual String DebugName() const = 0;
+
+  void Trace(blink::Visitor* visitor) override {}
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_