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

content/browser/indexed_db/database_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/indexed_db/database_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sequenced_task_runner.h"
 #include "base/threading/thread_checker.h"
@@ skipping 643 matching lines @@
     scoped_refptr<IndexedDBCallbacks> callbacks) {
   DCHECK(idb_thread_checker_.CalledOnValidThread());
   if (!connection_->IsConnected())
     return;
 
   IndexedDBTransaction* transaction =
       connection_->GetTransaction(transaction_id);
   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);
   connection_->database()->Put(transaction, object_store_id, &value, &handles,
                                base::MakeUnique<IndexedDBKey>(key), mode,
                                std::move(callbacks), index_keys);
 
   // Size can't be big enough to overflow because it represents the
   // actual bytes passed through IPC.
   transaction->set_size(transaction->size() + commit_size);
@@ skipping 241 matching lines @@
       usage + transaction->size() <= quota) {
     connection_->database()->Commit(transaction);
   } else {
     connection_->AbortTransaction(
         transaction,
         IndexedDBDatabaseError(blink::kWebIDBDatabaseExceptionQuotaError));
   }
 }
 
 }  // namespace content