Convert a few ppapi dev interfaces to IDL. NaCl has tests for these

ppapi/api/dev/ppb_cursor_control_dev.idl

+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPB_CursorControl_Dev</code> interface
+ * implemented by the browser for controlling the cursor.
+ */
+
+label Chrome {
+  M14 = 0.4
+};
+
+interface PPB_CursorControl_Dev {
+  /** 
+   * Set a cursor.  If "type" is PP_CURSORTYPE_CUSTOM, then "custom_image"
+   * must be an ImageData resource containing the cursor and "hot_spot" must
+   * contain the offset within that image that refers to the cursor's position.
+   */
+   PP_Bool SetCursor(
+       [in] PP_Instance instance,
+       [in] PP_CursorType_Dev type,
+       [in] PP_Resource custom_image,
+       [in] PP_Point hot_spot);

[dmichael (off chromium), 2011/11/17 19:04:41]

nit: Why not use C++-style indentation?

(I saw somebody else doing this style in their IDL; if there's a good reason for
it, please let me know so I can stop telling people the wrong thing :-) )

[jvoung - send to chromium..., 2011/11/17 20:51:34]

Oh, I guess I got lucky and picked an example IDL file that happened to have
this style. From my unscientific survey, I would say it's about 50-50 in each
style. Should I change or leave it alone?

[dmichael (off chromium), 2011/11/17 21:05:49]

If we're ~50-50, and there's no good reason to do it the above way (Noel??), I'm
going to push for following C++ style for any CLs I review. Thanks for being
accommodating :-)

[jvoung - send to chromium..., 2011/11/17 22:00:09]

Ok, done =)

+
+  /**
+   * This method causes the cursor to be moved to the center of the
+   * instance and be locked, preventing the user from moving it.
+   * The cursor is implicitly hidden from the user while locked.
+   * Cursor lock may only be requested in response to a
+   * PP_InputEvent_MouseDown, and then only if the event was generated via
+   * user gesture.
+   *
+   * While the cursor is locked, any movement of the mouse will
+   * generate a PP_InputEvent_Type_MouseMove, whose x and y values
+   * indicate the position the cursor would have been moved to had
+   * the cursor not been locked, and had the screen been infinite in size.
+   *
+   * The browser may revoke cursor lock for reasons including but not
+   * limited to the user pressing the ESC key, the user activating
+   * another program via a reserved keystroke (e.g., ALT+TAB), or
+   * some other system event.
+   *
+   * Returns PP_TRUE if the cursor could be locked, PP_FALSE otherwise.
+   */
+  PP_Bool LockCursor(
+      [in] PP_Instance instance);
+
+  /**
+   * Causes the cursor to be unlocked, allowing it to track user
+   * movement again.
+   */
+  PP_Bool UnlockCursor(
+      [in] PP_Instance instance);
+
+  /** 
+   * Returns PP_TRUE if the cursor is locked, PP_FALSE otherwise.
+   */
+  PP_Bool HasCursorLock(
+      [in] PP_Instance instance);
+
+  /**
+   * Returns PP_TRUE if the cursor can be locked, PP_FALSE otherwise.
+   */
+  PP_Bool CanLockCursor(
+      [in] PP_Instance instance);
+};
+