Add FontFaceSource interface and make it available on Document

third_party/WebKit/Source/core/css/DocumentFontFaceSet.idl

Index: third_party/WebKit/Source/core/css/DocumentFontFaceSet.idl
diff --git a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.idl b/third_party/WebKit/Source/core/css/DocumentFontFaceSet.idl
deleted file mode 100644
index c073a52a24b46783953ced0eb643faaeac86e9d0..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.idl
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-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-// https://dev.w3.org/csswg/css-font-loading/#font-face-source
-
-// TODO(foolip): This should be a FontFaceSource interface implemented by
-// Document and WorkerGlobalScope.
-partial interface Document {
-    [MeasureAs=DocumentFonts] readonly attribute FontFaceSet fonts;
-};