Add GlyphMetricsMap memory consumption to memory-infra tracing

third_party/WebKit/Source/platform/fonts/GlyphMetricsMap.h

 /*
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 39 matching lines @@
     T metricsForGlyph(Glyph glyph)
     {
         return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph);
     }
 
     void setMetricsForGlyph(Glyph glyph, const T& metrics)
     {
         locatePage(glyph / GlyphMetricsPage::size)->setMetricsForGlyph(glyph, metrics);
     }
 
+    size_t memoryUsageInBytes()
+    {
+        size_t totalValue = sizeof(*this);
+        if (m_pages) {
+            totalValue += m_pages->size() * sizeof(GlyphMetricsPage);
+        }
+        return totalValue;
+    }
+
 private:
     class GlyphMetricsPage {
         USING_FAST_MALLOC(GlyphMetricsPage);
         WTF_MAKE_NONCOPYABLE(GlyphMetricsPage);
     public:
         static const size_t size = 256; // Usually covers Latin-1 in a single page.
         GlyphMetricsPage() { }
 
         T metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; }
         void setMetricsForGlyph(Glyph glyph, const T& metrics)
@@ skipping 58 matching lines @@
     // Fill in the whole page with the unknown glyph information.
     for (unsigned i = 0; i < GlyphMetricsPage::size; i++)
         page->setMetricsForIndex(i, unknownMetrics());
 
     return page;
 }
 
 } // namespace blink
 
 #endif