assistant: Add flags

Bug: b/117793448
Test: histogram unit tests and manual test on device
Change-Id: I3233920570752391a295da90de1f9b48d1f02924
Reviewed-on: https://chromium-review.googlesource.com/c/1285049
Reviewed-by: Tao Wu <[email protected]>
Commit-Queue: Xiaohui Chen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#600157}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index cbb8dac..12cda67 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -4466,6 +4466,12 @@
      kOsAndroid, FEATURE_VALUE_TYPE(safe_browsing::kUseLocalBlacklistsV2)},
 #endif  // defined(OS_ANDROID)
 
+#if defined(OS_CHROMEOS)
+    {"enable-native-google-assistant",
+     flag_descriptions::kEnableGoogleAssistantName,
+     flag_descriptions::kEnableGoogleAssistantDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::switches::kAssistantFeature)},
+#endif  // defined(OS_ANDROID)
 };
 
 class FlagsStateSingleton {