Migrating MediaSession messages to mojo

mojo/common/common_custom_types_struct_traits.h

Index: mojo/common/common_custom_types_struct_traits.h
diff --git a/mojo/common/common_custom_types_struct_traits.h b/mojo/common/common_custom_types_struct_traits.h
index 82e5a8a7a9a5b285b8937b9a77279d7e58fd6879..23f178a35bb69d0121cfa37ca9d7def4c052022a 100644
--- a/mojo/common/common_custom_types_struct_traits.h
+++ b/mojo/common/common_custom_types_struct_traits.h
@@ -5,6 +5,7 @@
 #ifndef MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_H_
 #define MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_H_
 
+#include "base/strings/utf_string_conversions.h"
 #include "base/unguessable_token.h"
 #include "base/version.h"
 #include "mojo/common/common_custom_types.mojom-shared.h"
@@ -12,6 +13,21 @@
 
 namespace mojo {
 
+template<>
+struct StructTraits<mojo::common::mojom::String16DataView, base::string16> {
+  static std::vector<uint16_t> data(const base::string16& str) {
+    return std::vector<uint16_t>(str.data(), str.data() + str.size());
+  }
+  static bool Read(mojo::common::mojom::String16DataView data,
+                   base::string16* out) {
+    std::vector<uint16_t> raw_data;
+    if (!data.ReadData(&raw_data))
+      return false;
+    out->assign(raw_data.data(), raw_data.size());
+    return true;
+  }
+};
+
 template <>
 struct StructTraits<mojo::common::mojom::VersionDataView, base::Version> {
   static bool IsNull(const base::Version& version) {