Adding a Views scrollbar implementation.

views/controls/scrollbar/base_scroll_bar_button.cc

+// 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.
+
+#include "views/controls/scrollbar/base_scroll_bar_button.h"
+
+namespace views {
+
+BaseScrollBarButton::BaseScrollBarButton(ButtonListener* listener)
+    : CustomButton(listener),
+      ALLOW_THIS_IN_INITIALIZER_LIST(repeater_(
+          NewCallback<BaseScrollBarButton>(this,
+              &BaseScrollBarButton::NotifyClick))) {
+}
+
+BaseScrollBarButton::~BaseScrollBarButton() {
+}
+
+bool BaseScrollBarButton::OnMousePressed(const MouseEvent& event) {
+  Button::NotifyClick(event);
+  repeater_.Start();
+  return true;
+}
+
+void BaseScrollBarButton::OnMouseReleased(const MouseEvent& event) {
+  OnMouseCaptureLost();
+}
+
+void BaseScrollBarButton::OnMouseCaptureLost() {
+  repeater_.Stop();
+}
+
+void BaseScrollBarButton::NotifyClick() {
+#if defined(OS_WIN)
+  DWORD pos = GetMessagePos();
+  POINTS points = MAKEPOINTS(pos);
+  gfx::Point cursor_point(points.x, points.y);
+#elif defined(OS_LINUX)
+  gfx::Point cursor_point = gfx::Screen::GetCursorScreenPoint();
+#endif
+  views::MouseEvent event(ui::ET_MOUSE_RELEASED,
+                          cursor_point.x(), cursor_point.y(),
+                          ui::EF_LEFT_BUTTON_DOWN);
+  Button::NotifyClick(event);
+}
+
+}  // namespace views