Remove dependency on cc::TestNowSource from scheduler code

content/test/test_time_source.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 CONTENT_TEST_TEST_TIME_SOURCE_H_
+#define CONTENT_TEST_TEST_TIME_SOURCE_H_
+
+#include "base/memory/ref_counted.h"
+#include "content/child/scheduler/time_source.h"
+
+namespace cc {
+class TestNowSource;
+}
+
+namespace content {
+
+class TestTimeSource : public TimeSource {
+ public:
+  explicit TestTimeSource(scoped_refptr<cc::TestNowSource> time_source);
+  ~TestTimeSource() override;
+
+  base::TimeTicks Now() const override;
+
+ private:
+  scoped_refptr<cc::TestNowSource> time_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestTimeSource);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_TEST_TIME_SOURCE_H_