Add support for refreshing contents of providers which don't support watchers.

chrome/common/extensions/api/file_system_provider_capabilities/file_system_provider_capabilities_handler.cc

 // Copyright 2015 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.
 
 #include "chrome/common/extensions/api/file_system_provider_capabilities/file_system_provider_capabilities_handler.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/common/extensions/api/manifest_types.h"
 #include "extensions/common/error_utils.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/manifest_handlers/permissions_parser.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 FileSystemProviderCapabilities::FileSystemProviderCapabilities()
-    : configurable_(false), multiple_mounts_(false), source_(SOURCE_FILE) {
+    : configurable_(false),
+      watchable_(false),
+      multiple_mounts_(false),
+      source_(SOURCE_FILE) {
 }
 
 FileSystemProviderCapabilities::FileSystemProviderCapabilities(
     bool configurable,
+    bool watchable,
     bool multiple_mounts,
     FileSystemProviderSource source)
     : configurable_(configurable),
+      watchable_(watchable),
       multiple_mounts_(multiple_mounts),
       source_(source) {
 }
 
 FileSystemProviderCapabilities::~FileSystemProviderCapabilities() {
 }
 
 FileSystemProviderCapabilitiesHandler::FileSystemProviderCapabilitiesHandler() {
 }
 
@@ skipping 55 matching lines @@
       break;
     case api::manifest_types::FILE_SYSTEM_PROVIDER_SOURCE_NONE:
       NOTREACHED();
   }
 
   scoped_ptr<FileSystemProviderCapabilities> capabilities(
       new FileSystemProviderCapabilities(
           idl_capabilities.configurable.get()
               ? *idl_capabilities.configurable.get()
               : false /* false by default */,
+          idl_capabilities.watchable.get() ? *idl_capabilities.watchable.get()
+                                           : false /* false by default */,
           idl_capabilities.multiple_mounts.get()
               ? *idl_capabilities.multiple_mounts.get()
               : false /* false by default */,
           source));
 
   extension->SetManifestData(manifest_keys::kFileSystemProviderCapabilities,
                              capabilities.release());
   return true;
 }
 
 const std::vector<std::string> FileSystemProviderCapabilitiesHandler::Keys()
     const {
   return SingleKey(manifest_keys::kFileSystemProviderCapabilities);
 }
 
 bool FileSystemProviderCapabilitiesHandler::AlwaysParseForType(
     Manifest::Type type) const {
   return true;
 }
 
 }  // namespace extensions