Mojo C++ bindings: provide data view for all object types.

mojo/public/cpp/bindings/string_traits.h

Index: mojo/public/cpp/bindings/string_traits.h
diff --git a/mojo/public/cpp/bindings/string_traits.h b/mojo/public/cpp/bindings/string_traits.h
index a6ade6fdf68df0c036af4edc3dd4a9289267b1d9..7d3075a579704dfb46ea68e2ca6158f54edff19f 100644
--- a/mojo/public/cpp/bindings/string_traits.h
+++ b/mojo/public/cpp/bindings/string_traits.h
@@ -5,26 +5,10 @@
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_H_
 
-#include "base/logging.h"
-#include "mojo/public/cpp/bindings/lib/array_internal.h"
+#include "mojo/public/cpp/bindings/string_data_view.h"
 
 namespace mojo {
 
-// Access to the contents of a serialized string.
-class StringDataView {
- public:
-  explicit StringDataView(internal::String_Data* data) : data_(data) {
-    DCHECK(data_);
-  }
-
-  const char* storage() const { return data_->storage(); }
-
-  size_t size() const { return data_->size(); }
-
- private:
-  internal::String_Data* data_;
-};
-
 // This must be specialized for any type |T| to be serialized/deserialized as
 // a mojom string.
 //
@@ -40,6 +24,7 @@ class StringDataView {
 //     static size_t GetSize(const CustomString& input);
 //     static const char* GetData(const CustomString& input);
 //
+//     // The caller guarantees that |!input.is_null()|.
 //     static bool Read(StringDataView input, CustomString* output);
 //   };
 //