Minor changes to the comments of ResourceTracker and PP_ImageDataFormat.

ppapi/c/ppb_image_data.h

 /* Copyright (c) 2010 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_C_PPB_IMAGE_DATA_H_
 #define PPAPI_C_PPB_IMAGE_DATA_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_size.h"
 #include "ppapi/c/pp_stdint.h"
 
 /**
  * @file
  * This file defines the PPB_ImageData struct for determining how a browser
  * handles image data.
  */
 
 /**
  * @addtogroup Enums
  * @{
  */
 
 /**
  * PP_ImageDataFormat is an enumeration of the different types of
  * image data formats.
+ *
+ * The third part of each enumeration value describes the memory layout from
+ * the lowest address to the highest. For example, BGRA means the B component
+ * is stored in the lowest address, no matter what endianness the platform is
+ * using.
  */
 typedef enum {
   PP_IMAGEDATAFORMAT_BGRA_PREMUL,
   PP_IMAGEDATAFORMAT_RGBA_PREMUL
 } PP_ImageDataFormat;
 PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_ImageDataFormat, 4);
 /**
  * @}
  */
 
@@ skipping 123 matching lines @@
    *
    * @param[in] image_data A PP_Resource corresponding to image data.
    */
   void (*Unmap)(PP_Resource image_data);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_IMAGE_DATA_H_ */
-