Expose --top-chrome-md=touch-optimized in chrome://flags on Linux/CrOS.

Bug: 801582
Change-Id: Ib2afbbeee9fb45137d7942159ef517d3c769f13b
Reviewed-on: https://chromium-review.googlesource.com/942584
Reviewed-by: Dominick Ng <[email protected]>
Commit-Queue: Trent Apted <[email protected]>
Cr-Commit-Position: refs/heads/master@{#540090}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index be2f9302..91537fbc 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -937,6 +937,7 @@
 extern const char kTopChromeMdMaterial[];
 extern const char kTopChromeMdMaterialAuto[];
 extern const char kTopChromeMdMaterialHybrid[];
+extern const char kTopChromeMdMaterialTouchOptimized[];
 
 extern const char kThreadedScrollingName[];
 extern const char kThreadedScrollingDescription[];