chromeos: Add SingleProcessMash feature to about:flags

This will let us more easily test on canary channel Chromebooks.

Bug: none
Change-Id: Ie382991d547f0e48d8198fc4037580033a9dfb3a
Reviewed-on: https://chromium-review.googlesource.com/1211880
Reviewed-by: Jun Mukai <[email protected]>
Commit-Queue: James Cook <[email protected]>
Cr-Commit-Position: refs/heads/master@{#589629}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 909a26c..a77ab4f 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1765,6 +1765,9 @@
     {"show-touch-hud", flag_descriptions::kShowTouchHudName,
      flag_descriptions::kShowTouchHudDescription, kOsCrOS,
      SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)},
+    {"single-process-mash", flag_descriptions::kSingleProcessMashName,
+     flag_descriptions::kSingleProcessMashDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(features::kSingleProcessMash)},
 #endif  // OS_CHROMEOS
     {
         "disable-accelerated-video-decode",