Media Controls: move timeline related code to modules.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlTimelineElement.h

+// 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 MediaControlTimelineElement_h
+#define MediaControlTimelineElement_h
+
+#include "core/html/shadow/MediaControlElementTypes.h"
+#include "modules/media_controls/elements/MediaControlTimelineMetrics.h"
+
+namespace blink {
+
+class Event;
+class MediaControlsImpl;
+
+class MediaControlTimelineElement final : public MediaControlInputElement {
+ public:
+  explicit MediaControlTimelineElement(MediaControlsImpl&);
+
+  // MediaControlInputElement overrides.
+  bool WillRespondToMouseClickEvents() override;
+
+  // FIXME: An "earliest possible position" will be needed once that concept
+  // is supported by HTMLMediaElement, see https://crbug.com/137275
+  void SetPosition(double);
+  void SetDuration(double);
+
+  void OnPlaying();
+
+ private:
+  void DefaultEventHandler(Event*) override;
+  bool KeepEventInNode(Event*) override;
+
+  // Width in CSS pixels * pageZoomFactor (ignores CSS transforms for
+  // simplicity; deliberately ignores pinch zoom's pageScaleFactor).
+  int TimelineWidth();
+
+  MediaControlTimelineMetrics metrics_;
+};
+
+}  // namespace blink
+
+#endif  // MediaControlTimelineElement