font_prewarmer.mojom

// Copyright 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module chrome.mojom;

// Used to prewarm fonts. This interface is exposed per renderer. Note
// that prewarming actually happens in a background thread.
interface FontPrewarmer {
  // Prewarms fonts previously returned via RenderFrameFontFamilyAccessor.
  PrewarmFonts(array<string> primary_font_names,
               array<string> fallback_font_names);
};

// Used to request the fonts used to generate first contenful paint. This is
// exposed per RenderFrame and is an associated interface.
interface RenderFrameFontFamilyAccessor {
  // Requests the set of fonts used to generate first contentful paint.
  GetFontFamilyNames() => (array<string> primary_font_names,
                           array<string> fallback_font_names);
};