[tracing] Add sqlite memory statistics to tracing.

sql/sql_memory_dump_provider_unittest.cc

+// Copyright 2015 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 "sql/sql_memory_dump_provider.h"
+
+#include "base/trace_event/process_memory_dump.h"
+#include "sql/test/sql_test_base.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+using SQLMemoryDumpProviderTest = sql::SQLTestBase;
+}
+
+TEST_F(SQLMemoryDumpProviderTest, OnMemoryDump) {
+  base::trace_event::ProcessMemoryDump pmd(nullptr);
+  base::trace_event::MemoryDumpArgs args = {
+      base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
+  ASSERT_TRUE(
+      sql::SqlMemoryDumpProvider::GetInstance()->OnMemoryDump(args, &pmd));
+  ASSERT_TRUE(pmd.GetAllocatorDump("sqlite"));
+}