Add callback to LevelDBWrapperImpl to allow extra operations on commit.

content/browser/dom_storage/local_storage_context_mojo_unittest.cc

Index: content/browser/dom_storage/local_storage_context_mojo_unittest.cc
diff --git a/content/browser/dom_storage/local_storage_context_mojo_unittest.cc b/content/browser/dom_storage/local_storage_context_mojo_unittest.cc
index 81f6b5707a4316460a759bf8caf2cecd1b7341a9..0da3bd685ccdf113802fae711815f948c70a3cc7 100644
--- a/content/browser/dom_storage/local_storage_context_mojo_unittest.cc
+++ b/content/browser/dom_storage/local_storage_context_mojo_unittest.cc
@@ -72,6 +72,7 @@ TEST_F(LocalStorageContextMojoTest, Basic) {
   wrapper.reset();
 
   base::RunLoop().RunUntilIdle();
+
   ASSERT_EQ(2u, mock_data().size());
   EXPECT_EQ(value, mock_data().rbegin()->second);
 }
@@ -134,4 +135,23 @@ TEST_F(LocalStorageContextMojoTest, InvalidVersion) {
   EXPECT_FALSE(success);
 }
 
+TEST_F(LocalStorageContextMojoTest, VersionOnlyWrittenOnCommit) {
+  mojom::LevelDBWrapperPtr wrapper;
+  context()->OpenLocalStorage(url::Origin(GURL("http://foobar.com")),
+                              MakeRequest(&wrapper));
+
+  base::RunLoop run_loop;
+  bool success = false;
+  std::vector<uint8_t> result;
+  wrapper->Get(
+      StdStringToUint8Vector("key"),
+      base::Bind(&GetCallback, run_loop.QuitClosure(), &success, &result));
+  run_loop.Run();
+  EXPECT_FALSE(success);
+  wrapper.reset();
+
+  base::RunLoop().RunUntilIdle();
+  EXPECT_TRUE(mock_data().empty());
+}
+
 }  // namespace content