Adds ash::MaterialDesignController

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index f488aedc3ccf5320dd2f638ac3f510690074b021..39e28f3400c0dc6f6f5c047f51c6ba2f06d72252 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -866,6 +866,9 @@ const FeatureEntry kFeatureEntries[] = {
         IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_DESCRIPTION, kOsCrOS,
         SINGLE_VALUE_TYPE(ash::switches::kAshEnableMirroredScreen),
     },
+    {"ash-enable-md", IDS_FLAGS_ASH_MD, IDS_FLAGS_ASH_MD_DESCRIPTION, kOsCrOS,
+     ENABLE_DISABLE_VALUE_TYPE(ash::switches::kAshEnableMaterialDesign,

[bruthig, 2016/04/26 14:00:48]

Suggestion, I've found it easier to use a tri-state flag with a 'Default' over
the binary ENABLE_DISABLE_VALUE_TYPE.

[varkha, 2016/04/26 15:06:02]

ENABLE_DISABLE_VALUE_TYPE is already tri-state (default / enabled / disabled).
Your concern is exactly why I did it this way - to allow switching what our
default is without changing too many files - that would be just a change in the
md_controller.cc

+                               ash::switches::kAshDisableMaterialDesign)},
     {
         "ash-stable-overview-order", IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_NAME,
         IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_DESCRIPTION, kOsCrOS,