Add support code to test the cast system tray item.

ash/test/tray_cast_test_api.h

+// Copyright 2015 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 ASH_TEST_TRAY_CAST_TEST_API_H_
+#define ASH_TEST_TRAY_CAST_TEST_API_H_
+
+#include <string>
+
+#include "ash/ash_export.h"
+#include "ash/system/cast/tray_cast.h"
+
+namespace ash {
+
+class ASH_EXPORT TrayCastTestAPI {
+ public:
+  explicit TrayCastTestAPI(TrayCast* tray_cast);
+  ~TrayCastTestAPI();
+
+  bool IsTrayInitializedForTest() const;

[oshima, 2015/07/17 22:59:29]

You can simply call it IsTrayInitialized() because all methods here should be
for tests.

[jdufault, 2015/07/18 00:55:42]

Done.

+  bool IsTrayVisibleForTest() const;
+
+  // IsTrayCastViewVisibleForTest returns true if the active casting view is
+  // visible, ie, the TrayCast believes we are casting.
+  // IsTraySelectViewVisibleForTest returns true when the view for selecting a
+  // receiver is active, ie, the TrayCast believes we are not casting.
+  bool IsTrayCastViewVisibleForTest() const;
+  bool IsTraySelectViewVisibleForTest() const;
+
+  // Start a new cast to the given receiver.
+  void StartCastForTest(const std::string& receiver_id);
+  void StopCastForTest();
+
+  // Exposed callback to update the casting state. The test code needs to call
+  // this function manually, as there is no actual casting going on. In a real
+  // environment, this method is invoked by the casting system in Chrome.
+  void OnCastingSessionStartedOrStopped(bool is_casting);
+
+ private:
+  TrayCast* tray_cast_;
+};

[oshima, 2015/07/17 22:59:28]

DISALLOW_COPY_AND_ASSIGN

[jdufault, 2015/07/18 00:55:42]

Done.

+
+}  // namespace ash
+
+#endif  // ASH_TEST_TRAY_CAST_TEST_API_H_