Add Physical Web experiment and command line flags

ios/chrome/browser/about_flags.mm

 // Copyright 2012 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.
 
 // Implementation of about_flags for iOS that sets flags based on experimental
 // settings.
 
 #include "ios/chrome/browser/about_flags.h"
 
 #include <stddef.h>
@@ skipping 100 matching lines @@
 
   // Populate command line flags from PasswordGenerationEnabled.
   NSString* enablePasswordGenerationValue =
       [defaults stringForKey:@"PasswordGenerationEnabled"];
   if ([enablePasswordGenerationValue isEqualToString:@"Enabled"]) {
     command_line->AppendSwitch(switches::kEnableIOSPasswordGeneration);
   } else if ([enablePasswordGenerationValue isEqualToString:@"Disabled"]) {
     command_line->AppendSwitch(switches::kDisableIOSPasswordGeneration);
   }
 
+  // Populate command line flags from PhysicalWebEnabled.
+  NSString* enablePhysicalWebValue =
+      [defaults stringForKey:@"PhysicalWebEnabled"];
+  if ([enablePhysicalWebValue isEqualToString:@"Enabled"]) {
+    command_line->AppendSwitch(switches::kEnableIOSPhysicalWeb);
+  } else if ([enablePhysicalWebValue isEqualToString:@"Disabled"]) {
+    command_line->AppendSwitch(switches::kDisableIOSPhysicalWeb);
+  }
+
   // Web page replay flags.
   BOOL webPageReplayEnabled = [defaults boolForKey:@"WebPageReplayEnabled"];
   NSString* webPageReplayProxy =
       [defaults stringForKey:@"WebPageReplayProxyAddress"];
   if (webPageReplayEnabled && [webPageReplayProxy length]) {
     command_line->AppendSwitch(switches::kIOSIgnoreCertificateErrors);
     // 80 and 443 are the default ports from web page replay.
     command_line->AppendSwitchASCII(switches::kIOSTestingFixedHttpPort, "80");
     command_line->AppendSwitchASCII(switches::kIOSTestingFixedHttpsPort, "443");
     command_line->AppendSwitchASCII(
@@ skipping 153 matching lines @@
 }
 
 namespace testing {
 
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing