overview: Add a flag to disable rounded corners.

Test: manual
Bug: 926046
Change-Id: I66534d5f13371eb622ca7c9e5e7fbdcfb8b5c086
Reviewed-on: https://chromium-review.googlesource.com/c/1441961
Reviewed-by: Elly Fong-Jones <[email protected]>
Reviewed-by: Mitsuru Oshima <[email protected]>
Commit-Queue: Sammie Quon <[email protected]>
Cr-Commit-Position: refs/heads/master@{#627484}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index ed9e771..74fda64 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3075,6 +3075,11 @@
 const char kAshEnableDisplayMoveWindowAccelsDescription[] =
     "Enable shortcuts for moving window between displays.";
 
+const char kAshEnableOverviewRoundedCornersName[] =
+    "Enable rounded corners in overview mode.";
+const char kAshEnableOverviewRoundedCornersDescription[] =
+    "Enables rounded corners on overview windows.";
+
 const char kAshEnablePersistentWindowBoundsName[] =
     "Enable persistent window bounds in multi-displays scenario.";
 const char kAshEnablePersistentWindowBoundsDescription[] =