Implement the renderer side of the mojo based local storage implementation.

This is based on the existing chrome IPC based implementation.

BUG=586194

Review URL: https://codereview.chromium.org/1814003002

Cr-Commit-Position: refs/heads/master@{#382138}

3 files changed, 58 insertions, 8 deletions

diff --git a/mojo/common/common_type_converters.cc b/mojo/common/common_type_converters.cc
index 2740853..78418f8 100644
--- a/mojo/common/common_type_converters.cc
+++ b/mojo/common/common_type_converters.cc
@@ -39,9 +39,9 @@ base::string16 TypeConverter<base::string16, String>::Convert(
   return base::UTF8ToUTF16(input.To<base::StringPiece>());
 }
 
-std::string TypeConverter<std::string, Array<uint8_t> >::Convert(
+std::string TypeConverter<std::string, Array<uint8_t>>::Convert(
     const Array<uint8_t>& input) {
-  if (input.is_null() || input.size() == 0u)
+  if (input.is_null() || input.empty())
     return std::string();
 
   return std::string(reinterpret_cast<const char*>(&input.front()),
@@ -51,9 +51,26 @@ std::string TypeConverter<std::string, Array<uint8_t> >::Convert(
 Array<uint8_t> TypeConverter<Array<uint8_t>, std::string>::Convert(
     const std::string& input) {
   Array<uint8_t> result(input.size());
-  if (input.size() > 0)
+  if (!input.empty())
     memcpy(&result.front(), input.c_str(), input.size());
   return result;
 }
 
+base::string16 TypeConverter<base::string16, Array<uint8_t>>::Convert(
+    const Array<uint8_t>& input) {
+  if (input.is_null() || input.empty())
+    return base::string16();
+
+  return base::string16(reinterpret_cast<const base::char16*>(&input.front()),
+                        input.size() / sizeof(base::char16));
+}
+
+Array<uint8_t> TypeConverter<Array<uint8_t>, base::string16>::Convert(
+    const base::string16& input) {
+  Array<uint8_t> result(input.size() * sizeof(base::char16));
+  if (!input.empty())
+    memcpy(&result.front(), input.c_str(), input.size() * sizeof(base::char16));
+  return result;
+}
+
 }  // namespace mojo
diff --git a/mojo/common/common_type_converters.h b/mojo/common/common_type_converters.h
index 5f6e3c5..6dc31f1 100644
--- a/mojo/common/common_type_converters.h
+++ b/mojo/common/common_type_converters.h
@@ -36,12 +36,8 @@ struct MOJO_COMMON_EXPORT TypeConverter<base::string16, String> {
   static base::string16 Convert(const String& input);
 };
 
-// TODO(erg): In the very long term, we will want to remove conversion between
-// std::strings and arrays of unsigned bytes. However, there is too much code
-// across chrome which uses std::string as a bag of bytes that we probably
-// don't want to roll this function at each callsite.
 template <>
-struct MOJO_COMMON_EXPORT TypeConverter<std::string, Array<uint8_t> > {
+struct MOJO_COMMON_EXPORT TypeConverter<std::string, Array<uint8_t>> {
   static std::string Convert(const Array<uint8_t>& input);
 };
 
@@ -50,6 +46,16 @@ struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, std::string> {
   static Array<uint8_t> Convert(const std::string& input);
 };
 
+template <>
+struct MOJO_COMMON_EXPORT TypeConverter<base::string16, Array<uint8_t>> {
+  static base::string16 Convert(const Array<uint8_t>& input);
+};
+
+template <>
+struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, base::string16> {
+  static Array<uint8_t> Convert(const base::string16& input);
+};
+
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_
diff --git a/mojo/common/common_type_converters_unittest.cc b/mojo/common/common_type_converters_unittest.cc
index af8f640..302bcbe 100644
--- a/mojo/common/common_type_converters_unittest.cc
+++ b/mojo/common/common_type_converters_unittest.cc
@@ -108,6 +108,33 @@ TEST(CommonTypeConvertersTest, StdStringToArrayUint8) {
   EXPECT_EQ('a', data[3]);
 }
 
+TEST(CommonTypeConvertersTest, ArrayUint8ToString16) {
+  Array<uint8_t> data(8);
+  data[0] = 'd';
+  data[2] = 'a';
+  data[4] = 't';
+  data[6] = 'a';
+
+  EXPECT_EQ(base::ASCIIToUTF16("data"), data.To<base::string16>());
+}
+
+TEST(CommonTypeConvertersTest, String16ToArrayUint8) {
+  base::string16 input(base::ASCIIToUTF16("data"));
+  Array<uint8_t> data = Array<uint8_t>::From(input);
+
+  ASSERT_EQ(8ul, data.size());
+  EXPECT_EQ('d', data[0]);
+  EXPECT_EQ('a', data[2]);
+  EXPECT_EQ('t', data[4]);
+  EXPECT_EQ('a', data[6]);
+}
+
+TEST(CommonTypeConvertersTest, String16ToArrayUint8AndBack) {
+  base::string16 input(base::ASCIIToUTF16("data"));
+  Array<uint8_t> data = Array<uint8_t>::From(input);
+  EXPECT_EQ(input, data.To<base::string16>());
+}
+
 TEST(CommonTypeConvertersTest, EmptyStringToArrayUint8) {
   Array<uint8_t> data = Array<uint8_t>::From(std::string());