[Home] Show opt-out survey snackbar when Chrome Home disabled

Adds a feature flag to show a snackbar prompting users to take a survey
the first time they opt out of Chrome Home.

BUG=773461

Change-Id: Ib5a4492e182e58b347f7677f60e762eae61a3f81
Reviewed-on: https://chromium-review.googlesource.com/713761
Commit-Queue: Theresa <[email protected]>
Reviewed-by: Ilya Sherman <[email protected]>
Reviewed-by: Matthew Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#508234}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c61035d..866d383 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1923,6 +1923,10 @@
     {"enable-chrome-home-doodle", flag_descriptions::kChromeHomeDoodleName,
      flag_descriptions::kChromeHomeDoodleDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kChromeHomeDoodle)},
+    {"enable-chrome-home-opt-out-snackbar",
+     flag_descriptions::kChromeHomeOptOutSnackbarName,
+     flag_descriptions::kChromeHomeOptOutSnackbarDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kChromeHomeOptOutSnackbar)},
     {"enable-chrome-home-personalized-omnibox-suggestions",
      flag_descriptions::kChromeHomePersonalizedOmniboxSuggestionsName,
      flag_descriptions::kChromeHomePersonalizedOmniboxSuggestionsDescription,