Add FontFaceSource interface and make it available on Document

third_party/WebKit/Source/core/css/BUILD.gn

 # Copyright 2016 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.
 
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("css") {
   split_count = 5
   sources = [
     "ActiveStyleSheets.cpp",
@@ skipping 162 matching lines @@
     "CSSVariableData.cpp",
     "CSSVariableData.h",
     "CSSVariableReferenceValue.cpp",
     "CSSVariableReferenceValue.h",
     "CSSViewportRule.cpp",
     "CSSViewportRule.h",
     "ComputedStyleCSSValueMapping.cpp",
     "ComputedStyleCSSValueMapping.h",
     "DOMWindowCSS.cpp",
     "DOMWindowCSS.h",
-    "DocumentFontFaceSet.cpp",
-    "DocumentFontFaceSet.h",
     "ElementRuleCollector.cpp",
     "ElementRuleCollector.h",
     "FontFace.cpp",
     "FontFace.h",
     "FontFaceCache.cpp",
     "FontFaceCache.h",
     "FontFaceSet.cpp",
     "FontFaceSet.h",
     "FontFaceSetLoadEvent.cpp",
     "FontFaceSetLoadEvent.h",
+    "FontFaceSource.cpp",
+    "FontFaceSource.h",
     "FontSize.cpp",
     "FontSize.h",
     "FontStyleMatcher.cpp",
     "FontStyleMatcher.h",
     "HashTools.h",
     "KeyframeStyleRuleCSSStyleDeclaration.cpp",
     "KeyframeStyleRuleCSSStyleDeclaration.h",
     "LocalFontFaceSource.cpp",
     "LocalFontFaceSource.h",
     "MediaList.cpp",
@@ skipping 350 matching lines @@
     "resolver/TransformBuilder.h",
     "resolver/ViewportStyleResolver.cpp",
     "resolver/ViewportStyleResolver.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }