Implement workspace scrubbing 

BUG=160903
Test=Manual

Review URL: https://chromiumcodereview.appspot.com/11417150

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170688 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index fac6881e..9bac947 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1028,6 +1028,12 @@
     kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kAshEnableTabScrubbing),
   },
+  { "ash-enable-workspace-scrubbing",
+    IDS_FLAGS_ENABLE_WORKSPACE_SCRUBBING_NAME,
+    IDS_FLAGS_ENABLE_WORKSPACE_SCRUBBING_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(ash::switches::kAshEnableWorkspaceScrubbing),
+  },
   { "ash-enable-immersive-mode",
     IDS_FLAGS_ENABLE_IMMERSIVE_MODE_NAME,
     IDS_FLAGS_ENABLE_IMMERSIVE_MODE_DESCRIPTION,