Use FakeDesktopMediaList for Desktop Capture API tests.

chrome/browser/media/fake_desktop_media_list.h

Index: chrome/browser/media/fake_desktop_media_list.h
diff --git a/chrome/browser/media/fake_desktop_media_list.h b/chrome/browser/media/fake_desktop_media_list.h
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+++ b/chrome/browser/media/fake_desktop_media_list.h
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+// Copyright 2013 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 CHROME_BROWSER_MEDIA_FAKE_DESKTOP_MEDIA_LIST_H_
+#define CHROME_BROWSER_MEDIA_FAKE_DESKTOP_MEDIA_LIST_H_
+
+#include <vector>
+
+#include "chrome/browser/media/desktop_media_list.h"
+
+class FakeDesktopMediaList : public DesktopMediaList {
+ public:
+  FakeDesktopMediaList();
+  virtual ~FakeDesktopMediaList();
+
+  void AddSource(int id);
+  void RemoveSource(int index);
+  void SetSourceThumbnail(int index);
+  void SetSourceName(int index, string16 name);
+
+  // DesktopMediaList implementation:
+  virtual void SetUpdatePeriod(base::TimeDelta period) OVERRIDE;
+  virtual void SetThumbnailSize(const gfx::Size& thumbnail_size) OVERRIDE;
+  virtual void SetViewDialogWindowId(
+      content::DesktopMediaID::Id dialog_id) OVERRIDE;
+  virtual void StartUpdating(DesktopMediaListObserver* observer) OVERRIDE;
+  virtual int GetSourceCount() const OVERRIDE;
+  virtual const Source& GetSource(int index) const OVERRIDE;
+
+ private:
+  std::vector<Source> sources_;
+  DesktopMediaListObserver* observer_;
+  gfx::ImageSkia thumbnail_;
+};
+
+#endif  // CHROME_BROWSER_MEDIA_FAKE_DESKTOP_MEDIA_LIST_H_