[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/scoped_file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/metrics/statistics_recorder.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 1269 matching lines @@
 
   samples = tester.GetHistogramSamplesSinceCreation(kCommitTime);
   ASSERT_TRUE(samples);
   // 100 for commit adjust, 1 for measuring COMMIT.
   EXPECT_EQ(101, samples->sum());
 
   samples = tester.GetHistogramSamplesSinceCreation(kAutoCommitTime);
   EXPECT_EQ(0, samples->sum());
 }
 
+TEST_F(SQLConnectionTest, OnMemoryDump) {
+  base::trace_event::ProcessMemoryDump pmd(nullptr);
+  base::trace_event::MemoryDumpArgs args = {
+      base::trace_event::MemoryDumpArgs::LevelOfDetail::HIGH};
+  ASSERT_TRUE(db().OnMemoryDump(args, &pmd));
+  EXPECT_NE(0u, pmd.allocator_dumps().size());

[Primiano Tucci (use gerrit), 2015/09/30 10:26:56]

Doesn't make a huge difference, but probably more readable if you say _GE(0u)

[ssid, 2015/10/02 17:06:10]

Done.

+}
+
 }  // namespace