Put apps grid gap feature behind its flag

Changes:
The feature was under home launcher feature flag, but it should also be
in regular launcher. So put it behind its own flag.

Bug: 850188
Change-Id: Ifd1b8acd98c4b03aa710c552bc5c40fba4711f89
Reviewed-on: https://chromium-review.googlesource.com/1089380
Commit-Queue: Weidong Guo <[email protected]>
Reviewed-by: Xiyuan Xia <[email protected]>
Cr-Commit-Position: refs/heads/master@{#565125}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index e38739f9..8e51333 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3753,6 +3753,10 @@
     {"enable-home-launcher", flag_descriptions::kEnableHomeLauncherName,
      flag_descriptions::kEnableHomeLauncherDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(app_list::features::kEnableHomeLauncher)},
+
+    {"enable-apps-grid-gap", flag_descriptions::kEnableAppsGridGapFeatureName,
+     flag_descriptions::kEnableAppsGridGapFeatureDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(app_list::features::kEnableAppsGridGapFeature)},
 #endif  // OS_CHROMEOS
 
 #if defined(OS_WIN)