[tracing] Memory dump provider for leveldb_proto

components/leveldb_proto/proto_database_impl_unittest.cc

Index: components/leveldb_proto/proto_database_impl_unittest.cc
diff --git a/components/leveldb_proto/proto_database_impl_unittest.cc b/components/leveldb_proto/proto_database_impl_unittest.cc
index 648b2e20509719c609ce6e2d792d3ddf6c6cd952..d7848018efc0366da3742473ca4c154669ea075c 100644
--- a/components/leveldb_proto/proto_database_impl_unittest.cc
+++ b/components/leveldb_proto/proto_database_impl_unittest.cc
@@ -487,6 +487,8 @@ TEST(ProtoDatabaseImplThreadingTest, TestDBDestroy) {
 // entries. If |close_after_save| is true, the database will be closed after
 // saving and then re-opened to ensure that the data is properly persisted.
 void TestLevelDBSaveAndLoad(bool close_after_save) {
+  base::MessageLoop main_loop;
+
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
 
@@ -549,6 +551,8 @@ TEST(ProtoDatabaseImplLevelDBTest, TestDBInitFail) {
 }
 
 TEST(ProtoDatabaseImplLevelDBTest, TestMemoryDatabase) {
+  base::MessageLoop main_loop;
+
   std::unique_ptr<LevelDB> db(new LevelDB(kTestLevelDBClientName));
 
   std::vector<std::string> load_entries;