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

content/browser/indexed_db/indexed_db_transaction.cc

 // Copyright (c) 2013 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/indexed_db_transaction.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 363 matching lines @@
 
   DCHECK_EQ(state_, COMMITTING);
 
   state_ = FINISHED;
 
   leveldb::Status s;
   bool committed;
   if (!used_) {
     committed = true;
   } else {
+    base::TimeDelta active_time = base::Time::Now() - diagnostics_.start_time;
+    uint64_t size = transaction_->GetTransactionSize() / 1024;
+    switch (mode_) {
+      case blink::kWebIDBTransactionModeReadOnly:
+        UMA_HISTOGRAM_MEDIUM_TIMES(
+            "WebCore.IndexedDB.Transaction.ReadOnly.TimeActive", active_time);
+        UMA_HISTOGRAM_MEMORY_KB(
+            "WebCore.IndexedDB.Transaction.ReadOnly.SizeOnCommit", size);
+        break;
+      case blink::kWebIDBTransactionModeReadWrite:
+        UMA_HISTOGRAM_MEDIUM_TIMES(
+            "WebCore.IndexedDB.Transaction.ReadWrite.TimeActive", active_time);
+        UMA_HISTOGRAM_MEMORY_KB(
+            "WebCore.IndexedDB.Transaction.ReadWrite.SizeOnCommit", size);
+        break;
+      case blink::kWebIDBTransactionModeVersionChange:
+        UMA_HISTOGRAM_MEDIUM_TIMES(
+            "WebCore.IndexedDB.Transaction.VersionChange.TimeActive",
+            active_time);
+        UMA_HISTOGRAM_MEMORY_KB(
+            "WebCore.IndexedDB.Transaction.VersionChange.SizeOnCommit", size);
+        break;
+      default:
+        NOTREACHED();
+    }
+
     s = transaction_->CommitPhaseTwo();
     committed = s.ok();
   }
 
   // Backing store resources (held via cursors) must be released
   // before script callbacks are fired, as the script callbacks may
   // release references and allow the backing store itself to be
   // released, and order is critical.
   CloseOpenCursors();
   transaction_->Reset();
@@ skipping 166 matching lines @@
 
 ::indexed_db::mojom::ObserverChangesPtr*
 IndexedDBTransaction::GetPendingChangesForConnection(int32_t connection_id) {
   auto it = connection_changes_map_.find(connection_id);
   if (it != connection_changes_map_.end())
     return &it->second;
   return nullptr;
 }
 
 }  // namespace content