Add check for SimpleFontData in ShapeResult

Tbr: drott@chromium.org
Bug: 982221
Change-Id: Ifbe5ab69899ea8a165813efab652caabe2e35d14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692034Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675776}

third_party/blink/renderer/platform/fonts/shaping/shape_result.cc

@@ -1386,6 +1386,7 @@ scoped_refptr<ShapeResult> ShapeResult::CreateForTabulationCharacters(
     unsigned length) {
   DCHECK_GT(length, 0u);
   const SimpleFontData* font_data = font->PrimaryFont();
+  DCHECK(font_data);
   scoped_refptr<ShapeResult> result =
       ShapeResult::Create(font, start_index, length, direction);
   result->num_glyphs_ = length;
@@ -1428,6 +1429,7 @@ scoped_refptr<ShapeResult> ShapeResult::CreateForSpaces(const Font* font,
                                                         float width) {
   DCHECK_GT(length, 0u);
   const SimpleFontData* font_data = font->PrimaryFont();
+  DCHECK(font_data);
   scoped_refptr<ShapeResult> result =
       ShapeResult::Create(font, start_index, length, direction);
   result->num_glyphs_ = length;