Add support for drive files to chrome.fileBrowserHandler.selectFile

chrome/common/extensions/api/file_browser_handler.json

 // 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.
 
 [
   {
     "namespace":"fileBrowserHandler",
     "platforms": ["chromeos"],
     "types": [
       {
@@ skipping 32 matching lines @@
             "description": "File handler execute event details."
           }
         ]
       }
     ],
 
     "functions": [
       {
         "name": "selectFile",
         "type": "function",
-        "description": "Prompts user to select file path under which a new file will be created. When the user selects file, the file gets created or, if it already existed, truncated. The function has to be called with a user gesture.",
+        "description": "Prompts user to select file path under which file should be saved. When the file is selected, file access permission required to use the file (read, write and create) are granted to the caller. The file will not actually get created during the functin call, so function caller must ensure its existance before using it. The function has to be invoked with a user gesture.",
         "parameters": [
           {
             "name": "selectionParams",
             "type": "object",
-            "description": "Parameters that will be used to create a new file.",
+            "description": "Parameters that will be used while selecting the file.",
             "properties": {
               "suggestedName": {
                   "type": "string",
-                  "description": "Suggested name for the new file."
+                  "description": "Suggested name for the file."
               }
             } 
           },
           {
             "name": "callback",
             "type": "function",
             "description": "Function called upon completion.",
             "parameters": [
               {
                 "name": "result",
                 "description": "Result of the method.",
                 "type": "object",
                 "properties": {
                   "success": {
                     "type": "boolean",
-                    "description": "Has the file been selected."
+                    "description": "Whether the file has been selected."
                   },
                   "entry": {
                     "type": "object",
                     "constructor": "Entry",
                     "optional": true,
                     "description": "Selected file entry. It will be null if a file hasn't been selected."
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]