Split View Mode: Support for the 2-finger bezel scroll.

athena/wm/split_view_controller.h

Index: athena/wm/split_view_controller.h
diff --git a/athena/wm/split_view_controller.h b/athena/wm/split_view_controller.h
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+++ b/athena/wm/split_view_controller.h
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+// Copyright 2014 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 ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
+#define ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
+
+#include "athena/wm/bezel_controller.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace athena {
+
+// Responsible for entering split view mode, exiting from split view mode, and
+// laying out the windows in split view mode.
+class SplitViewController : public BezelController::ScrollDelegate {
+ public:
+  SplitViewController();
+  virtual ~SplitViewController();
+
+ private:
+  // BezelController::ScrollDelegate overrides.
+  virtual void ScrollBegin(BezelController::Bezel bezel, float delta) OVERRIDE;
+  virtual void ScrollEnd() OVERRIDE;
+  virtual void ScrollUpdate(float delta) OVERRIDE;
+  virtual bool CanScroll() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(SplitViewController);
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_