Move bounds and width function sanity checks to computation function

third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp

Index: third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp b/third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp
index 07c733561eb673c384bae6c7bf0d828326a4b6d3..ec4178843c45a72f90f71ec4e3314d3e510f402a 100644
--- a/third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp
+++ b/third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp
@@ -373,6 +373,11 @@ PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescri
 
 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
 {
+    if (!m_platformData.size())
+        return FloatRect();
+
+    static_assert(sizeof(glyph) == 2, "Glyph id should not be truncated.");
+
     SkRect bounds;
     SkiaTextMetrics(&m_paint).getSkiaBoundsForGlyph(glyph, &bounds);
     return FloatRect(bounds);
@@ -380,6 +385,11 @@ FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
 
 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
 {
+    if (!m_platformData.size())
+        return 0;
+
+    static_assert(sizeof(glyph) == 2, "Glyph id should not be truncated.");
+
     return SkiaTextMetrics(&m_paint).getSkiaWidthForGlyph(glyph);
 }