Reland change for aura tooltips that was revert due to build break:

ui/views/widget/tooltip_manager_aura.h

+// Copyright (c) 2011 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 UI_VIEWS_WIDGET_TOOLTIP_MANAGER_AURA_H_
+#define UI_VIEWS_WIDGET_TOOLTIP_MANAGER_AURA_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/string16.h"
+#include "ui/gfx/point.h"
+#include "ui/views/widget/tooltip_manager.h"
+
+namespace views {
+
+class NativeWidgetAura;
+class View;
+
+// TooltipManager implementation for Aura.
+class TooltipManagerAura : public TooltipManager {
+ public:
+  explicit TooltipManagerAura(NativeWidgetAura* native_widget_aura);
+  virtual ~TooltipManagerAura();
+
+  // TooltipManager.
+  virtual void UpdateTooltip() OVERRIDE;
+  virtual void TooltipTextChanged(View* view) OVERRIDE;
+  virtual void ShowKeyboardTooltip(View* view) OVERRIDE;
+  virtual void HideKeyboardTooltip() OVERRIDE;
+
+ private:
+  View* GetViewUnderPoint(const gfx::Point& point);
+
+  NativeWidgetAura* native_widget_aura_;
+  string16 tooltip_text_;
+
+  DISALLOW_COPY_AND_ASSIGN(TooltipManagerAura);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_TOOLTIP_MANAGER_AURA_H_