[tracing] Add sqlite memory statistics to tracing.

sql/connection_unittest.cc

 // Copyright (c) 2012 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 "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/files/scoped_file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/histogram_tester.h"
+#include "base/trace_event/process_memory_dump.h"
 #include "sql/connection.h"
 #include "sql/correct_sql_test_base.h"
 #include "sql/meta_table.h"
 #include "sql/statement.h"
 #include "sql/test/error_callback_support.h"
 #include "sql/test/scoped_error_ignorer.h"
 #include "sql/test/test_helpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/sqlite/sqlite3.h"
 
@@ skipping 1347 matching lines @@
       base::File f(db_path(), kFlags);
       ASSERT_TRUE(f.IsValid());
       buf[0] = '4';
       ASSERT_EQ(f.Write(kOffset, buf, 1), 1);
     }
     ASSERT_EQ('4', m.data()[kOffset]);
   }
 }
 #endif
 
+TEST_F(SQLConnectionTest, OnMemoryDump) {
+  base::trace_event::ProcessMemoryDump pmd(nullptr);
+  base::trace_event::MemoryDumpArgs args = {
+      base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
+  ASSERT_TRUE(db().OnMemoryDump(args, &pmd));
+  EXPECT_GE(pmd.allocator_dumps().size(), 1u);
+}
+
 }  // namespace