Fixing a crash in MediaCustomControlsFullscreenDetector when the page is destroyed

third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.h

Index: third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.h
diff --git a/third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.h b/third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.h
new file mode 100644
index 0000000000000000000000000000000000000000..83e1af5fb80ddbf968d0f4e73673e10f5f35de38
--- /dev/null
+++ b/third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.h
@@ -0,0 +1,56 @@
+// 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.
+
+#include "public/platform/WebMediaPlayer.h"
+
+#ifndef EmptyWebMediaPlayer_h
+#define EmptyWebMediaPlayer_h
+
+namespace blink {
+
+// An empty WebMediaPlayer used only for tests. This class defines the methods
+// of WebMediaPlayer so that mock WebMediaPlayers don't need to redefine them if
+// they don't care their behavior.
+class EmptyWebMediaPlayer : public WebMediaPlayer {
+ public:
+  ~EmptyWebMediaPlayer() override {}
+
+  void load(LoadType, const WebMediaPlayerSource&, CORSMode) override {}
+  void play() override {}
+  void pause() override {}
+  bool supportsSave() const override { return false; }
+  void seek(double seconds) override {}
+  void setRate(double) override {}
+  void setVolume(double) override {}
+  WebTimeRanges buffered() const override;
+  WebTimeRanges seekable() const override;
+  void setSinkId(const WebString& sinkId,
+                 const WebSecurityOrigin&,
+                 WebSetSinkIdCallbacks*) override {}
+  bool hasVideo() const override { return false; }
+  bool hasAudio() const override { return false; }
+  WebSize naturalSize() const override;
+  bool paused() const override { return false; }
+  bool seeking() const override { return false; }
+  double duration() const override { return 0.0; }
+  double currentTime() const override { return 0.0; }
+  NetworkState getNetworkState() const override { return NetworkStateEmpty; }
+  ReadyState getReadyState() const override { return ReadyStateHaveNothing; }
+  WebString getErrorMessage() override { return WebString(); }
+  bool didLoadingProgress() override { return false; }
+  bool hasSingleSecurityOrigin() const override { return true; }
+  bool didPassCORSAccessCheck() const override { return true; }
+  double mediaTimeForTimeValue(double timeValue) const override {
+    return timeValue;
+  };
+  unsigned decodedFrameCount() const override { return 0; }
+  unsigned droppedFrameCount() const override { return 0; }
+  size_t audioDecodedByteCount() const override { return 0; }
+  size_t videoDecodedByteCount() const override { return 0; }
+  void paint(WebCanvas*, const WebRect&, cc::PaintFlags&) override {}
+};
+
+}  // namespace blink
+
+#endif  // EmptyWebMediaPlayer_h