Add comment to PPB_MouseInputEvent version 1.1 that GetMovement hasn't been supported.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/7834007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99792 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/c/ppb_input_event.h

@@ -475,6 +475,10 @@ struct PPB_MouseInputEvent {
    *
    * @return The change in position of the mouse, relative to the previous
    * position.
+   *
+   * TODO(yzshen): This feature hasn't been supported yet. The returned value is
+   * always (0, 0) for system-generated mouse events (which are passed through
+   * the <code>HandleInputEvent</code>).
    */
   struct PP_Point (*GetMovement)(PP_Resource mouse_event);
 };

ppapi/cpp/input_event.h

@@ -159,6 +159,10 @@ class MouseInputEvent : public InputEvent {
   ///
   /// @return The change in position of the mouse, relative to the previous
   /// position.
+  ///
+  /// TODO(yzshen): This feature hasn't been supported yet. The returned value
+  /// is always (0, 0) for system-generated mouse events (which are passed
+  /// through the <code>HandleInputEvent</code>).
   Point GetMovement() const;
 };