Introduce IOSChromeMetricsServicesManagerClient

ios/chrome/browser/chrome_switches.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 "ios/chrome/browser/chrome_switches.h"
 
 namespace switches {
 
 // -----------------------------------------------------------------------------
 // When commenting your switch, please use the same voice as surrounding
@@ skipping 16 matching lines @@
 
 // Enables the use of WKWebView instead of UIWebView.
 const char kEnableIOSWKWebView[] = "enable-wkwebview";
 
 // Enables context-sensitive reader mode button in the toolbar.
 const char kEnableReaderModeToolbarIcon[] = "enable-reader-mode-toolbar-icon";
 
 // Disables support for keyboard commands.
 const char kDisableKeyboardCommands[] = "disable-keyboard-commands";
 
+// Enables the recording of metrics reports but disables reporting. In contrast
+// to kDisableMetrics, this executes all the code that a normal client would
+// use for reporting, except the report is dropped rather than sent to the
+// server. This is useful for finding issues in the metrics code during UI and
+// performance tests.
+const char kIOSMetricsRecordingOnly[] = "metrics-recording-only";
+
 }  // namespace switches