Add check that Dwrite glyph fits in unicode table.

src/ports/SkTypeface_win_dw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTypes.h"
 // SkTypes will include Windows.h, which will pull in all of the GDI defines.
 // GDI #defines GetGlyphIndices to GetGlyphIndicesA or GetGlyphIndicesW, but
@@ skipping 268 matching lines @@
 using namespace skia_advanced_typeface_metrics_utils;
 
 // Construct Glyph to Unicode table.
 // Unicode code points that require conjugate pairs in utf16 are not
 // supported.
 // TODO(bungeman): This never does what anyone wants.
 // What is really wanted is the text to glyphs mapping
 static void populate_glyph_to_unicode(IDWriteFontFace* fontFace,
                                       const unsigned glyphCount,
                                       SkTDArray<SkUnichar>* glyphToUnicode) {
-    HRESULT hr = S_OK;
-
     //Do this like free type instead
     SkAutoTMalloc<SkUnichar> glyphToUni(glyphCount);
     int maxGlyph = -1;
     for (UINT32 c = 0; c < 0x10FFFF; ++c) {
-        UINT16 glyph;
-        hr = fontFace->GetGlyphIndices(&c, 1, &glyph);
-        SkASSERT(glyph < glyphCount);
+        UINT16 glyph = 0;
+        HRVM(fontFace->GetGlyphIndices(&c, 1, &glyph),
+             "Failed to get glyph index.");
+        // Intermittent DW bug on Windows 10. See crbug.com/470146.
+        if (glyph >= glyphCount) {
+          return;
+        }
         if (0 < glyph) {
             maxGlyph = SkTMax(static_cast<int>(glyph), maxGlyph);
             glyphToUni[glyph] = c;
         }
     }
 
     SkTDArray<SkUnichar>(glyphToUni, maxGlyph + 1).swap(*glyphToUnicode);
 }
 
 static bool getWidthAdvance(IDWriteFontFace* fontFace, int gId, int16_t* advance) {
@@ skipping 146 matching lines @@
                 getAdvanceData(fDWriteFontFace.get(),
                                glyphCount,
                                glyphIDs,
                                glyphIDsCount,
                                getWidthAdvance));
         }
     }
 
     return info;
 }