Reland of ix misc asserts and checks found by fuzzer

samplecode/SampleFilterFuzz.cpp

Index: samplecode/SampleFilterFuzz.cpp
diff --git a/samplecode/SampleFilterFuzz.cpp b/samplecode/SampleFilterFuzz.cpp
index f8ceed452cd4bb4229b4748101057519266769f4..45b43df9536a69277d3690906816726725eb06a4 100644
--- a/samplecode/SampleFilterFuzz.cpp
+++ b/samplecode/SampleFilterFuzz.cpp
@@ -204,7 +204,7 @@
 }
 
 static SkPath1DPathEffect::Style make_path_1d_path_effect_style() {
-    return static_cast<SkPath1DPathEffect::Style>(R(SkPath1DPathEffect::kStyleCount));
+    return static_cast<SkPath1DPathEffect::Style>(R((int)SkPath1DPathEffect::kMorph_Style + 1));
 }
 
 static SkColor make_color() {
@@ -529,7 +529,9 @@
     paint.setMaskFilter(make_mask_filter());
     SkAutoTUnref<SkTypeface> typeface(
         SkTypeface::CreateFromName(make_font_name().c_str(), make_typeface_style()));
+#if 0
     paint.setTypeface(typeface);
+#endif
     SkLayerRasterizer::Builder rasterizerBuilder;
     SkPaint paintForRasterizer;
     if (R(2) == 1) {