[Files.app] Fetch and use CWS OAuth token instead of Drive token in Suggest app dialog.

chrome/common/extensions/api/file_browser_private.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":"fileBrowserPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/chromeos/extensions/file_manager/file_browser_private_api_functions.h"
     },
@@ skipping 1171 matching lines @@
               {
                 "name": "accessToken",
                 "type": "string",
                 "description": "OAuth2 access token, or an empty string if failed to fetch."
               }
             ]
           }
         ]
       },
       {
+        "name": "requestWebStoreAccessToken",
+        "description": "Requests a Webstore API OAuth2 access token.",
+        "parameters": [
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "accessToken",
+                "type": "string",
+                "description": "OAuth2 access token, or an empty string if failed to fetch."
+              }
+            ]
+          }
+        ]
+      },
+      {
         "name": "getShareUrl",
         "description": "Requests a share dialog url for the specified file.",
         "parameters": [
           {
             "name": "url",
             "type": "string",
             "description": "Url for the file."
           },
           {
             "name": "callback",
@@ skipping 116 matching lines @@
       },
       {
         "name": "onDriveConnectionStatusChanged",
         "type": "function",
         "description": "Fired when the active network connection state changes. The network connection state can be retrieved via 'getDriveConnectionState'.",
         "parameters": []
       }
     ]
   }
 ]