[tracing] Add sqlite memory statistics to tracing.

sql/connection_unittest.cc

Index: sql/connection_unittest.cc
diff --git a/sql/connection_unittest.cc b/sql/connection_unittest.cc
index 10a15a868908965d893ce4952388bd09688e4e19..56e311f1e2ef8d58f19215c53cac601525ec4eef 100644
--- a/sql/connection_unittest.cc
+++ b/sql/connection_unittest.cc
@@ -9,6 +9,7 @@
 #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"
@@ -1298,4 +1299,12 @@ TEST_F(SQLConnectionTest, TimeUpdateTransaction) {
   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_GE(pmd.allocator_dumps().size(), 1u);
+}
+
 }  // namespace