Add a new Chromium feature for partial style recalc after font loading

This patch adds a new Chromium feature to control the Blink runtime
enabled feature CSSReducedFontLoadingInvalidations. This allows us to
study performance impacts of the feature via finch experiments.

Bug: 441925
Change-Id: Icba6f1f1899af0bcecc12cf570786a07364f4fab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040616
Reviewed-by: Kentaro Hara <[email protected]>
Commit-Queue: Xiaocheng Hu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#738864}
diff --git a/third_party/blink/common/features.cc b/third_party/blink/common/features.cc
index 3929f2d..6a8c93c5 100644
--- a/third_party/blink/common/features.cc
+++ b/third_party/blink/common/features.cc
@@ -453,5 +453,8 @@
 const base::Feature kForceExtraRenderingToTrackStickyFrame{
     "ForceExtraRenderingToTrackStickyFrame", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kCSSReducedFontLoadingInvalidations{
+    "CSSReducedFontLoadingInvalidations", base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace features
 }  // namespace blink