[MD Bookmarks] Add skeleton for Material Design Bookmarks

BUG=658980
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2450623002
Cr-Commit-Position: refs/heads/master@{#428961}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 9dde9dfa..a94a74be 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1728,6 +1728,9 @@
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppLink,
                                switches::kDisableAppLink)},
 #endif  // OS_ANDROID
+    {"enable-md-bookmarks", IDS_FLAGS_ENABLE_MATERIAL_DESIGN_BOOKMARKS_NAME,
+     IDS_FLAGS_ENABLE_MATERIAL_DESIGN_BOOKMARKS_DESCRIPTION, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kMaterialDesignBookmarks)},
     {"enable-md-feedback", IDS_FLAGS_ENABLE_MATERIAL_DESIGN_FEEDBACK_NAME,
      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_FEEDBACK_DESCRIPTION, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kEnableMaterialDesignFeedback)},