Expose API for gx font variation axes.

src/core/SkFontMgr.cpp

Index: src/core/SkFontMgr.cpp
diff --git a/src/core/SkFontMgr.cpp b/src/core/SkFontMgr.cpp
index 524691646399c5716b4c6c57d4880c27d31c9529..ab04250c0343787f43358b4ec3e120a49ae0c56f 100644
--- a/src/core/SkFontMgr.cpp
+++ b/src/core/SkFontMgr.cpp
@@ -132,6 +132,13 @@ SkTypeface* SkFontMgr::createFromStream(SkStreamAsset* stream, int ttcIndex) con
     return this->onCreateFromStream(stream, ttcIndex);
 }
 
+SkTypeface* SkFontMgr::createFromStream(SkStreamAsset* stream, const FontParameters& params) const {
+    if (nullptr == stream) {
+        return nullptr;
+    }
+    return this->onCreateFromStream(stream, params);
+}
+
 SkTypeface* SkFontMgr::createFromFontData(SkFontData* data) const {
     if (nullptr == data) {
         return nullptr;
@@ -140,6 +147,11 @@ SkTypeface* SkFontMgr::createFromFontData(SkFontData* data) const {
 }
 
 // This implementation is temporary until it can be made pure virtual.
+SkTypeface* SkFontMgr::onCreateFromStream(SkStreamAsset* stream, const FontParameters& p) const {
+    return this->createFromStream(stream, p.getCollectionIndex());
+}
+
+// This implementation is temporary until it can be made pure virtual.
 SkTypeface* SkFontMgr::onCreateFromFontData(SkFontData* data) const {
     SkTypeface* ret = this->createFromStream(data->detachStream(), data->getIndex());
     delete data;