[USS] Implement GetAllData and GetStorageKey.

components/history/core/browser/typed_url_sync_metadata_database_unittest.cc

Index: components/history/core/browser/typed_url_sync_metadata_database_unittest.cc
diff --git a/components/history/core/browser/typed_url_sync_metadata_database_unittest.cc b/components/history/core/browser/typed_url_sync_metadata_database_unittest.cc
index c37bf3eeb7ec19d2ea3f094dbb74b0e7741a4123..f79d9bc1cd569afb4ade107627bb1199e346d576 100644
--- a/components/history/core/browser/typed_url_sync_metadata_database_unittest.cc
+++ b/components/history/core/browser/typed_url_sync_metadata_database_unittest.cc
@@ -4,8 +4,10 @@
 
 #include "components/history/core/browser/typed_url_sync_metadata_database.h"
 
+#include "base/big_endian.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
+#include "components/history/core/browser/url_row.h"
 #include "components/sync/protocol/model_type_state.pb.h"
 #include "sql/statement.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -17,6 +19,16 @@ using syncer::MetadataBatch;
 
 namespace history {
 
+namespace {
+
+std::string IntToStorageKey(int i) {
+  std::string storage_key(8, 0);
+  base::WriteBigEndian(&storage_key[0], static_cast<URLID>(i));

[pavely, 2017/06/01 20:49:18]

nit: I think you can explicitly specify which variant of WriteBigEndian to use
by providing template parameter:
base::WriteBigEndian<URLID>(storage_key.data(), i);

[Gang Wu, 2017/06/02 00:00:24]

Done.

+  return storage_key;
+}
+
+}  // namespace
+
 class TypedURLSyncMetadataDatabaseTest : public testing::Test,
                                          public TypedURLSyncMetadataDatabase {
  public:
@@ -60,8 +72,8 @@ TEST_F(TypedURLSyncMetadataDatabaseTest, TypedURLNoMetadata) {
 
 TEST_F(TypedURLSyncMetadataDatabaseTest, TypedURLGetAllSyncMetadata) {
   EntityMetadata metadata;
-  std::string storage_key = "1";
-  std::string storage_key2 = "2";
+  std::string storage_key = IntToStorageKey(0);
+  std::string storage_key2 = IntToStorageKey(1);
   metadata.set_sequence_number(1);
 
   EXPECT_TRUE(UpdateSyncMetadata(syncer::TYPED_URLS, storage_key, metadata));
@@ -96,7 +108,7 @@ TEST_F(TypedURLSyncMetadataDatabaseTest, TypedURLGetAllSyncMetadata) {
 TEST_F(TypedURLSyncMetadataDatabaseTest, TypedURLWriteThenDeleteSyncMetadata) {
   EntityMetadata metadata;
   MetadataBatch metadata_batch;
-  std::string storage_key = "1";
+  std::string storage_key = IntToStorageKey(1);
   ModelTypeState model_type_state;
 
   model_type_state.set_initial_sync_done(true);