More or less implement RenderTextHarfBuzz

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 92cfd1084ff6ff8b2fc6a7d34e93a2a021d2b0cb..d0857b4b8fe0461532f07d5e46e2b99cec432fd7 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6488,6 +6488,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_TEXT_INPUT_FOCUS_MANAGER_DESCRIPTION" desc="Description for the flag to enable the new text input focus manager.">
         Enable an experimental focus manager to track text input clients.
       </message>
+      <message name="IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_NAME" desc="Name of the about:flags HarfBuzz RenderText experiment.">
+        Enable HarfBuzz for UI.
+      </message>
+      <message name="IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_DESCRIPTION" desc="Description of the about:flags HarfBuzz RenderText experiment.">
+        Use the cross-platform HarfBuzz engine for UI text. Doesn't affect web content.
+      </message>
 
       <!-- Crashes -->
       <message name="IDS_CRASHES_TITLE" desc="Title for the chrome://crashes page.">