Add a configurable flag entry for font src: local() matching

Expose the feature flag as a chrome://flags configurable value.

Also remove obsolete kFontCacheScalingDescription declaration.

Bug: 867866
Change-Id: Ib674bd0845d228bc82c67a342c19ace8f39cb157
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660343
Commit-Queue: Dominik Röttsches <[email protected]>
Reviewed-by: Stephen Chenney <[email protected]>
Cr-Commit-Position: refs/heads/master@{#669738}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index b9c8d8e..33663c2 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3930,6 +3930,10 @@
      flag_descriptions::kPeriodicBackgroundSyncDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kPeriodicBackgroundSync)},
 
+    {"font-src-local-matching", flag_descriptions::kFontSrcLocalMatchingName,
+     flag_descriptions::kFontSrcLocalMatchingDescription, kOsAll,
+     FEATURE_VALUE_TYPE(features::kFontSrcLocalMatching)},
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the