Explicitly cast from HarfBuzz type to shorter type

Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp

Index: Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp
diff --git a/Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp b/Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp
index 5deb6772fe8361a87ec3b8c001df546fa2545028..64e30d48a78426b374c252d43310ad833d6f19da 100644
--- a/Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp
+++ b/Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp
@@ -128,7 +128,7 @@ static hb_position_t harfBuzzGetGlyphHorizontalKerning(hb_font_t*, void* fontDat
 
     SkTypeface* typeface = hbFontData->m_paint.getTypeface();
 
-    const uint16_t glyphs[2] = { leftGlyph, rightGlyph };
+    const uint16_t glyphs[2] = { static_cast<uint16_t>(leftGlyph), static_cast<uint16_t>(rightGlyph) };
     int32_t kerningAdjustments[1] = { 0 };
 
     if (typeface->getKerningPairAdjustments(glyphs, 2, kerningAdjustments)) {
@@ -150,7 +150,7 @@ static hb_position_t harfBuzzGetGlyphVerticalKerning(hb_font_t*, void* fontData,
 
     SkTypeface* typeface = hbFontData->m_paint.getTypeface();
 
-    const uint16_t glyphs[2] = { topGlyph, bottomGlyph };
+    const uint16_t glyphs[2] = { static_cast<uint16_t>(topGlyph), static_cast<uint16_t>(bottomGlyph) };
     int32_t kerningAdjustments[1] = { 0 };
 
     if (typeface->getKerningPairAdjustments(glyphs, 2, kerningAdjustments)) {