Enable compositing opaque fixed position elements which will maintain LCD text.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 2698bf32ae15ff7f5d97eb0f07acad7f861612f9..a0cc45165f80a8ed7fb7955cc8031b2247165a5f 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -306,6 +306,10 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   if (base::FeatureList::IsEnabled(features::kGamepadExtensions))
     WebRuntimeFeatures::enableGamepadExtensions(true);
 
+  if (!base::FeatureList::IsEnabled(features::kCompositeOpaqueFixedPosition))
+    WebRuntimeFeatures::enableFeatureFromString("CompositeOpaqueFixedPosition",
+        false);
+
   if (!base::FeatureList::IsEnabled(features::kCompositeOpaqueScrollers))
     WebRuntimeFeatures::enableFeatureFromString("CompositeOpaqueScrollers",
         false);