Allow controlling the Instant field trial through a command line flag.

chrome/common/chrome_switches.h

 // Copyright (c) 2011 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 169 matching lines @@
 extern const char kHideIcons[];
 extern const char kHomePage[];
 extern const char kHostRules[];
 extern const char kHostResolverParallelism[];
 extern const char kHostResolverRetryAttempts[];
 extern const char kHostResolverRules[];
 extern const char kHstsHosts[];
 extern const char kImport[];
 extern const char kImportFromFile[];
 extern const char kIncognito[];
+extern const char kInstantFieldTrial[];
+extern const char kInstantFieldTrialInstant[];
 extern const char kInstantURL[];
 extern const char kKeepAliveForTest[];
 extern const char kLoadExtension[];
 extern const char kLoadOpencryptoki[];
 extern const char kUninstallExtension[];
 extern const char kLogNetLog[];
 extern const char kMakeDefaultBrowser[];
 extern const char kMediaCacheSize[];
 extern const char kMemoryProfiling[];
 extern const char kMessageLoopHistogrammer[];
@@ skipping 165 matching lines @@
 bool IsPrintPreviewEnabled();
 
 bool IsInBrowserThumbnailingEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_