PPAPI: Update pp_var.h documentation for Resource vars.

ppapi/api/ppb_var.idl

 /* 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.
  */
 
 /**
  * This file defines the <code>PPB_Var</code> struct.
  */
 
 label Chrome {
@@ skipping 11 matching lines @@
    * object, this function will do nothing so you can always call it no matter
    * what the type.
    *
    * @param[in] var A <code>PP_Var</code> that will have a reference added.
    */
   [version=1.0]
   void AddRef([in] PP_Var var);
 
   /**
    * Release() removes a reference to given var, deleting it if the internal
-   * reference count becomes 0. If the given var is not a refcounted object,
-   * this function will do nothing so you can always call it no matter what
-   * the type.
+   * reference count becomes 0. If the <code>PP_Var</code> is of type
+   * <code>PP_VARTYPE_RESOURCE</code>,
+   * it will implicitly release a reference count on the
+   * <code>PP_Resource</code> (equivalent to PPB_Core::ReleaseResource()).
+   *
+   * If the given var is not a refcounted object, this function will do nothing
+   * so you can always call it no matter what the type.
    *
    * @param[in] var A <code>PP_Var</code> that will have a reference removed.
    */
   [version=1.0]
   void Release([in] PP_Var var);
 
   /**
    * VarFromUtf8() creates a string var from a string. The string must be
    * encoded in valid UTF-8 and is NOT NULL-terminated, the length must be
    * specified in <code>len</code>. It is an error if the string is not
@@ skipping 75 matching lines @@
    * @param[in] var A <code>PP_Var</code> struct containing a resource-type var.
    *
    * @return A <code>PP_Resource</code> retrieved from the var, or 0 if the var
    * is not a resource. The reference count of the resource is incremented on
    * behalf of the caller.
    */
   [version=1.2]
   PP_Resource VarToResource([in] PP_Var var);
 
   /**
-   * Creates a new <code>PP_Var</code> from a given resource.
+   * Creates a new <code>PP_Var</code> from a given resource. Implicitly adds a
+   * reference count on the <code>PP_Resource</code> (equivalent to
+   * <code>PPB_Core::AddRefResource(resource)</code>).

[raymes, 2014/04/09 00:16:18]

nit: also consistency issues with <code> around function calls. Feel free to
make an arbitrary choice since the surrounding comments aren't consistent either
by the looks of it.

    *
    * @param[in] resource A <code>PP_Resource</code> to be wrapped in a var.
    *
    * @return A <code>PP_Var</code> created for this resource, with type
    * <code>PP_VARTYPE_RESOURCE</code>. The reference count of the var is set to
    * 1 on behalf of the caller.
    */
   [version=1.2]
   PP_Var VarFromResource([in] PP_Resource resource);
 };