Add GlyphMetricsMap memory consumption to memory-infra tracing

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

Index: third_party/WebKit/Source/platform/fonts/FontDataCache.h
diff --git a/third_party/WebKit/Source/platform/fonts/FontDataCache.h b/third_party/WebKit/Source/platform/fonts/FontDataCache.h
index f08d5cfd8c8acbb192840d9209980d615e74cea0..496c7ff1f0c15f14a9061b94b8727c7f568f4bbc 100644
--- a/third_party/WebKit/Source/platform/fonts/FontDataCache.h
+++ b/third_party/WebKit/Source/platform/fonts/FontDataCache.h
@@ -36,6 +36,13 @@
 #include "wtf/HashMap.h"
 #include "wtf/ListHashSet.h"
 
+namespace base {
+namespace trace_event {
+class ProcessMemoryDump;
+}
+}
+
+
 namespace blink {
 
 class SimpleFontData;
@@ -85,6 +92,8 @@ public:
     // Returns true if any removal of cache items actually occurred.
     bool purge(PurgeSeverity);
 
+    void dumpCountAndGlyphToBoundsMaps(base::trace_event::ProcessMemoryDump*);
+
 private:
     bool purgeLeastRecentlyUsed(int count);