Launch cursor color by setting feature flag to enabled by default.

This is launching in M86. Flag can be removed in M87+ if all goes
well.

AX-Relnotes: Exposes custom cursor color setting and feature
Bug: 1094071
Change-Id: I999d87631a1441e85f149f80540a2fde8acff11a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2278085Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784488}

ui/accessibility/accessibility_features.cc

@@ -64,8 +64,8 @@ bool IsIChromeAccessibleEnabled() {
 #endif  // defined(OS_WIN)
 
 #if defined(OS_CHROMEOS)
-const base::Feature kAccessibilityCursorColor{
-    "AccessibilityCursorColor", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kAccessibilityCursorColor{"AccessibilityCursorColor",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 bool IsAccessibilityCursorColorEnabled() {
   return base::FeatureList::IsEnabled(::features::kAccessibilityCursorColor);