diff -r 000000000000 -r 6474c204b198 gfx/thebes/gfxFontFeatures.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/thebes/gfxFontFeatures.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gfxFontFeatures.h"
+#include "nsUnicharUtils.h"
+#include "nsHashKeys.h"
+
+using namespace mozilla;
+
+gfxFontFeatureValueSet::gfxFontFeatureValueSet()
+    : mFontFeatureValues(10)
+{
+}
+
+bool
+gfxFontFeatureValueSet::GetFontFeatureValuesFor(const nsAString& aFamily,
+                                                uint32_t aVariantProperty,
+                                                const nsAString& aName,
+                                                nsTArray<uint32_t>& aValues)
+{
+    nsAutoString family(aFamily), name(aName);
+    ToLowerCase(family);
+    ToLowerCase(name);
+    FeatureValueHashKey key(family, aVariantProperty, name);
+
+    aValues.Clear();
+    FeatureValueHashEntry *entry = mFontFeatureValues.GetEntry(key);
+    if (entry) {
+        NS_ASSERTION(entry->mValues.Length() > 0,
+                     "null array of font feature values");
+        aValues.AppendElements(entry->mValues);
+        return true;
+    }
+
+    return false;
+}
+
+
+void
+gfxFontFeatureValueSet::AddFontFeatureValues(const nsAString& aFamily,
+                 const nsTArray<gfxFontFeatureValueSet::FeatureValues>& aValues)
+{
+    nsAutoString family(aFamily);
+    ToLowerCase(family);
+
+    uint32_t i, numFeatureValues = aValues.Length();
+    for (i = 0; i < numFeatureValues; i++) {
+        const FeatureValues& fv = aValues.ElementAt(i);
+        uint32_t alternate = fv.alternate;
+        uint32_t j, numValues = fv.valuelist.Length();
+        for (j = 0; j < numValues; j++) {
+            const ValueList& v = fv.valuelist.ElementAt(j);
+            nsAutoString name(v.name);
+            ToLowerCase(name);
+            FeatureValueHashKey key(family, alternate, name);
+            FeatureValueHashEntry *entry = mFontFeatureValues.PutEntry(key);
+            entry->mKey = key;
+            entry->mValues = v.featureSelectors;
+        }
+    }
+}
+
+bool
+gfxFontFeatureValueSet::FeatureValueHashEntry::KeyEquals(
+                                               const KeyTypePointer aKey) const
+{
+    return aKey->mPropVal == mKey.mPropVal &&
+           aKey->mFamily.Equals(mKey.mFamily) &&
+           aKey->mName.Equals(mKey.mName);
+}
+
+PLDHashNumber
+gfxFontFeatureValueSet::FeatureValueHashEntry::HashKey(
+                                                     const KeyTypePointer aKey)
+{
+    return HashString(aKey->mFamily) + HashString(aKey->mName) +
+           aKey->mPropVal * uint32_t(0xdeadbeef);
+}
+