New tabCapture.captureOffscreenTab API, initially for Presentation API 1UA mode

extensions/browser/extension_function_histogram_value.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_
 #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_
 
 namespace extensions {
 namespace functions {
 
@@ skipping 1100 matching lines @@
   PRINTERPROVIDERINTERNAL_REPORTUSBPRINTERINFO,
   WEBCAMPRIVATE_OPENSERIALWEBCAM,
   WEBCAMPRIVATE_CLOSEWEBCAM,
   SERIAL_SETBREAK,
   SERIAL_CLEARBREAK,
   EXTENSIONVIEWINTERNAL_LOADSRC,
   EXTENSIONVIEWINTERNAL_PARSESRC,
   HID_GETUSERSELECTEDDEVICES,
   FILESYSTEMPROVIDERINTERNAL_GETACTIONSREQUESTEDSUCCESS,
   WEBSTOREPRIVATE_SHOWPERMISSIONPROMPTFORDELEGATEDBUNDLEINSTALL,
+  TABCAPTURE_CAPTUREPRESENTATION,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY
 };
 
 }  // namespace functions
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_