Add about flag for cursor control on Chrome for Android

Please note that tools/metrics/histograms/enums.xml is already modified
in a different change.

Bug: 1126778
Change-Id: I669654a427edb7d5120b0b0292856c6249d0f7fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552772
Reviewed-by: Ted Choc <[email protected]>
Commit-Queue: Shimi Zhang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#830293}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index df11bc7..9401136 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3220,6 +3220,10 @@
     "If enabled, when the user changes themes the current tabs are reparented "
     "instead of reloaded.";
 
+const char kSwipeToMoveCursorName[] = "Swipe to move cursor";
+const char kSwipeToMoveCursorDescription[] =
+    "Allows user to use touch gestures to move the text cursor around.";
+
 const char kTabbedAppOverflowMenuIconsName[] =
     "Android tabbed app overflow menu icons";
 const char kTabbedAppOverflowMenuIconsDescription[] =