Add feature flag for Enterprise policy HomepageLocation on Android

Add feature flag to control the exposure level of new feature during
development.

Bug: 978197
Change-Id: Ie9651ed8d981d6138409cafa30508d849d7b93b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900305
Commit-Queue: Wenyu Fu <[email protected]>
Reviewed-by: Theresa  <[email protected]>
Cr-Commit-Position: refs/heads/master@{#713107}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index d0277045..788f3032 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -4772,6 +4772,13 @@
      FEATURE_VALUE_TYPE(arc::kEnableApplicationZoomFeature)},
 #endif  // defined(OS_CHROMEOS)
 
+#if defined(OS_ANDROID)
+    {"enable-home-page-location-policy",
+     flag_descriptions::kHomepageLocationName,
+     flag_descriptions::kHomepageLocationDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kHomepageLocation)},
+#endif  // defined(OS_ANDROID)
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the