[IndexedDB] Adding txn, value, and key size metrics

content/browser/indexed_db/database_impl.cc

Index: content/browser/indexed_db/database_impl.cc
diff --git a/content/browser/indexed_db/database_impl.cc b/content/browser/indexed_db/database_impl.cc
index 191b0db0b91108b80c7124cf00568bafd64feca8..a9ebc60e5740d75afb41e5b7a43a079c705abdd7 100644
--- a/content/browser/indexed_db/database_impl.cc
+++ b/content/browser/indexed_db/database_impl.cc
@@ -661,7 +661,10 @@ void DatabaseImpl::IDBThreadHelper::Put(
   if (!transaction)
     return;
 
-  uint64_t commit_size = mojo_value->bits.size();
+  // Value size recorded in IDBObjectStore before we can auto-wrap in a blob.
+  UMA_HISTOGRAM_MEMORY_KB("WebCore.IndexedDB.PutKeySize", key.size_estimate());
+
+  uint64_t commit_size = mojo_value->bits.size() + key.size_estimate();
   IndexedDBValue value;
   swap(value.bits, mojo_value->bits);
   swap(value.blob_info, blob_info);