[HBD] Add flag in about:flags for PPS on ALLOW mode.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 8c01371c200db0624324aebee1e473f33040bd77..7297067cc561fb92ae7792d2a0d838f7305f71b8 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -904,6 +904,9 @@ const FeatureEntry kFeatureEntries[] = {
     {"allow-nacl-socket-api", IDS_FLAGS_ALLOW_NACL_SOCKET_API_NAME,
      IDS_FLAGS_ALLOW_NACL_SOCKET_API_DESCRIPTION, kOsDesktop,
      SINGLE_VALUE_TYPE_AND_VALUE(switches::kAllowNaClSocketAPI, "*")},
+    {"run-all-flash-in-allow-mode", IDS_FLAGS_RUN_ALL_FLASH_IN_ALLOW_MODE_NAME,
+     IDS_FLAGS_RUN_ALL_FLASH_IN_ALLOW_MODE_DESCRIPTION, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kRunAllFlashInAllowMode)},
 #endif  // ENABLE_PLUGINS
 #if defined(OS_CHROMEOS)
     {"mash", IDS_FLAGS_USE_MASH_NAME, IDS_FLAGS_USE_MASH_DESCRIPTION, kOsCrOS,