[fsp] Show request logs in chrome://provided-file-systems.

chrome/browser/chromeos/file_system_provider/request_manager.cc

 // Copyright 2014 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/browser/chromeos/file_system_provider/request_manager.h"
 
 #include "base/files/file.h"
 #include "base/stl_util.h"
 
 namespace chromeos {
 namespace file_system_provider {
-
 namespace {
 
 // Timeout in seconds, before a request is considered as stale and hence
 // aborted.
 const int kDefaultTimeout = 10;
 
 }  // namespace
 
+std::string RequestTypeToString(RequestType type) {
+  switch (type) {
+    case REQUEST_UNMOUNT:
+      return "REQUEST_UNMOUNT";
+    case GET_METADATA:
+      return "GET_METADATA";
+    case READ_DIRECTORY:
+      return "READ_DIRECTORY";
+    case OPEN_FILE:
+      return "OPEN_FILE";
+    case CLOSE_FILE:
+      return "CLOSE_FILE";
+    case READ_FILE:
+      return "READ_FILE";
+    case TESTING:
+      return "TESTING";
+  }
+  NOTREACHED();
+  return "";
+}
+
 RequestManager::RequestManager()
     : next_id_(1),
       timeout_(base::TimeDelta::FromSeconds(kDefaultTimeout)),
       weak_ptr_factory_(this) {}
 
 RequestManager::~RequestManager() {
   // Abort all of the active requests.
   RequestMap::iterator it = requests_.begin();
   while (it != requests_.end()) {
     const int request_id = it->first;
@@ skipping 108 matching lines @@
     return;
 
   delete request_it->second;
   requests_.erase(request_it);
 
   FOR_EACH_OBSERVER(Observer, observers_, OnRequestDestroyed(request_id));
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos