Add new MouseCursor interface for setting the mouse cursor.

ppapi/cpp/mouse_cursor.h

Index: ppapi/cpp/mouse_cursor.h
diff --git a/ppapi/cpp/mouse_cursor.h b/ppapi/cpp/mouse_cursor.h
new file mode 100644
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+++ b/ppapi/cpp/mouse_cursor.h
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+// Copyright (c) 2012 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 PPAPI_CPP_MOUSE_CURSOR_H_
+#define PPAPI_CPP_MOUSE_CURSOR_H_
+
+#include "ppapi/c/ppb_mouse_cursor.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/instance_handle.h"
+#include "ppapi/cpp/point.h"
+
+namespace pp {
+
+class MouseCursor {
+ public:
+  /// Sets the given mouse cursor. The mouse cursor will be in effect whenever
+  /// the mouse is over the given instance until it is set again by another
+  /// call. Note that you can hide the mouse cursor by setting it to the
+  /// <code>PP_MOUSECURSOR_TYPE_NONE</code> type.
+  ///
+  /// This function allows setting both system defined mouse cursors and
+  /// custom cursors. To set a system-defined cursor, pass the type you want
+  /// and set the custom image to a default-constructor ImageData object.
+  /// To set a custom cursor, set the type to
+  /// <code>PP_MOUSECURSOR_TYPE_CUSTOM</code> and specify your image and hot
+  /// spot.
+  ///
+  /// @param[in] instance A handle indentifying the instance that the mouse
+  /// cursor will affect.
+  ///
+  /// @param[in] type A <code>PP_MouseCursor_Type</code> identifying the type
+  /// of mouse cursor to show. See <code>ppapi/c/ppb_mouse_cursor.h</code>.
+  ///
+  /// @param[in] image A <code>ImageData</code> object identifying the
+  /// custom image to set when the type is
+  /// <code>PP_MOUSECURSOR_TYPE_CUSTOM</code>. The image must be less than 32
+  /// pixels in each direction and must be of the system's native image format.
+  /// When you are specifying a predefined cursor, this parameter should be a
+  /// default-constructed ImageData.
+  ///
+  /// @param[in] hot_spot When setting a custom cursor, this idenfifies the
+  /// pixel position within the given image of the "hot spot" of the cursor.
+  /// When specifying a stock cursor, this parameter is ignored.
+  ///
+  /// @return true on success, or false if the instance or cursor type
+  /// was invalid or if the image was too large.
+  static bool SetCursor(const InstanceHandle& instance,
+                        PP_MouseCursor_Type type,
+                        const ImageData& image = ImageData(),
+                        const Point& hot_spot = Point(0, 0));
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_MOUSE_CURSOR_H_