Fix crash in tracing due to identical type names of blink gc objects.

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1452 matching lines @@
 
 #undef SNAPSHOT_HEAP
 
     if (type == SnapshotType::FreelistSnapshot)
         return;
 
     size_t totalLiveCount = 0;
     size_t totalDeadCount = 0;
     size_t totalLiveSize = 0;
     size_t totalDeadSize = 0;
-    for (size_t i = 1; i <= GCInfoTable::gcInfoIndex(); ++i) {
-        String dumpName = classesDumpName + "/" + Heap::gcInfo(i)->className();
+    for (size_t gcInfoIndex = 1; gcInfoIndex <= GCInfoTable::gcInfoIndex(); ++gcInfoIndex) {
+        String dumpName = classesDumpName + String::format("/%zu_", gcInfoIndex) + Heap::gcInfo(gcInfoIndex)->className();
         WebMemoryAllocatorDump* classDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(dumpName);
-        classDump->AddScalar("live_count", "objects", info.liveCount[i]);
-        classDump->AddScalar("dead_count", "objects", info.deadCount[i]);
-        classDump->AddScalar("live_size", "bytes", info.liveSize[i]);
-        classDump->AddScalar("dead_size", "bytes", info.deadSize[i]);
+        classDump->AddScalar("live_count", "objects", info.liveCount[gcInfoIndex]);
+        classDump->AddScalar("dead_count", "objects", info.deadCount[gcInfoIndex]);
+        classDump->AddScalar("live_size", "bytes", info.liveSize[gcInfoIndex]);
+        classDump->AddScalar("dead_size", "bytes", info.deadSize[gcInfoIndex]);
 
-        totalLiveCount += info.liveCount[i];
-        totalDeadCount += info.deadCount[i];
-        totalLiveSize += info.liveSize[i];
-        totalDeadSize += info.deadSize[i];
+        totalLiveCount += info.liveCount[gcInfoIndex];
+        totalDeadCount += info.deadCount[gcInfoIndex];
+        totalLiveSize += info.liveSize[gcInfoIndex];
+        totalDeadSize += info.deadSize[gcInfoIndex];
     }
 
     WebMemoryAllocatorDump* threadDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(threadDumpName);
     threadDump->AddScalar("live_count", "objects", totalLiveCount);
     threadDump->AddScalar("dead_count", "objects", totalDeadCount);
     threadDump->AddScalar("live_size", "bytes", totalLiveSize);
     threadDump->AddScalar("dead_size", "bytes", totalDeadSize);
 
     WebMemoryAllocatorDump* heapsDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(heapsDumpName);
     WebMemoryAllocatorDump* classesDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(classesDumpName);
@@ skipping 90 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink