SkValidatingReadBuffer: make sure we don't call readTypeface().

src/core/SkValidatingReadBuffer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkErrorInternals.h"
 #include "SkValidatingReadBuffer.h"
@@ skipping 195 matching lines @@
     return readArray(values, size, sizeof(SkScalar));
 }
 
 uint32_t SkValidatingReadBuffer::getArrayCount() {
     const size_t inc = sizeof(uint32_t);
     fError = fError || !IsPtrAlign4(fReader.peek()) || !fReader.isAvailable(inc);
     return fError ? 0 : *(uint32_t*)fReader.peek();
 }
 
 SkTypeface* SkValidatingReadBuffer::readTypeface() {
+    SkASSERT(false);
     // TODO: Implement this (securely) when needed
     return nullptr;
 }
 
 bool SkValidatingReadBuffer::validateAvailable(size_t size) {
     return this->validate((size <= SK_MaxU32) && fReader.isAvailable(static_cast<uint32_t>(size)));
 }
 
 SkFlattenable* SkValidatingReadBuffer::readFlattenable(SkFlattenable::Type type) {
     SkString name;
@@ skipping 39 matching lines @@
 
 void SkValidatingReadBuffer::skipFlattenable() {
     SkString name;
     this->readString(&name);
     if (fError) {
         return;
     }
     uint32_t sizeRecorded = this->readUInt();
     this->skip(sizeRecorded);
 }