Adding hotkey behind a commandline to allow testing the TouchView maximizing mode.

The flag and the hotkey is only temporary since there is no other way to test the TouchView functionality at this time.

BUG=337563
TEST=visual

Review URL: https://codereview.chromium.org/179063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253369 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index ca27f89..5098fb3 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1188,6 +1188,12 @@
     kOsCrOS,
     SINGLE_VALUE_TYPE(ash::switches::kAshDisableDragAndDropAppListToLauncher),
   },
+  { "ash-enable-touch-view-testing",
+    IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_NAME,
+    IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(ash::switches::kAshEnableTouchViewTesting),
+  },
 #if defined(OS_LINUX)
   { "ash-enable-memory-monitor",
       IDS_FLAGS_ENABLE_MEMORY_MONITOR_NAME,