Const-correctness in PDF drawText() call

src/pdf/SkPDFDevice.cpp

Index: src/pdf/SkPDFDevice.cpp
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index 564fdc212393b82b6a5700ce9c3622abb7ca157b..736c50b9a6d8b0151ca8fbd7c1f445b545078883 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -1124,17 +1124,21 @@ void SkPDFDevice::drawText(const SkDraw& d, const void* text, size_t len,
     set_text_transform(x, y, textPaint.getTextSkewX(),
                        &content.entry()->fContent);
     int consumedGlyphCount = 0;
+
+    SkTDArray<uint16_t> glyphIDsCopy(glyphIDs, numGlyphs);
+
     while (numGlyphs > consumedGlyphCount) {
         updateFont(textPaint, glyphIDs[consumedGlyphCount], content.entry());
         SkPDFFont* font = content.entry()->fState.fFont;
-        //TODO: the const_cast here is a bug if the encoding started out as glyph encoding.
-        int availableGlyphs =
-            font->glyphsToPDFFontEncoding(const_cast<uint16_t*>(glyphIDs) + consumedGlyphCount,
-                                          numGlyphs - consumedGlyphCount);
-        fFontGlyphUsage->noteGlyphUsage(font, glyphIDs + consumedGlyphCount,
-                                        availableGlyphs);
+
+        int availableGlyphs = font->glyphsToPDFFontEncoding(
+                glyphIDsCopy.begin() + consumedGlyphCount,
+                numGlyphs - consumedGlyphCount);
+        fFontGlyphUsage->noteGlyphUsage(
+                font,  glyphIDsCopy.begin() + consumedGlyphCount,
+                availableGlyphs);
         SkString encodedString =
-            SkPDFString::FormatString(glyphIDs + consumedGlyphCount,
+            SkPDFString::FormatString(glyphIDsCopy.begin() + consumedGlyphCount,
                                       availableGlyphs, font->multiByteGlyphs());
         content.entry()->fContent.writeText(encodedString.c_str());
         consumedGlyphCount += availableGlyphs;