WIP POC blob transport over mojo

content/common/content_param_traits.cc

Index: content/common/content_param_traits.cc
diff --git a/content/common/content_param_traits.cc b/content/common/content_param_traits.cc
index 514473020a17eed4f9447e0eabc6c718e35567ce..3586c6c06fe58fea8ca0ad7d0462d6a6e43cdb2a 100644
--- a/content/common/content_param_traits.cc
+++ b/content/common/content_param_traits.cc
@@ -9,6 +9,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "content/common/accessibility_mode.h"
 #include "content/common/message_port.h"
+#include "ipc/ipc_mojo_message_helper.h"
 #include "ipc/ipc_mojo_param_traits.h"
 #include "net/base/ip_endpoint.h"
 #include "ui/events/blink/web_input_event_traits.h"
@@ -112,6 +113,52 @@ bool ParamTraits<content::AccessibilityMode>::Read(const base::Pickle* m,
 
 void ParamTraits<content::AccessibilityMode>::Log(const param_type& p,
                                                   std::string* l) {}
+
+void ParamTraits<storage::mojom::BlobPtr>::GetSize(base::PickleSizer* s,
+                                                   const param_type& p) {
+  GetParamSize(s, p.is_bound());
+  if (p.is_bound()) {
+    s->AddUInt32();
+    s->AddAttachment();
+  }
+}
+
+void ParamTraits<storage::mojom::BlobPtr>::Write(base::Pickle* m,
+                                                 const param_type& p) {
+  WriteParam(m, p.is_bound());
+  if (p.is_bound()) {
+    storage::mojom::BlobPtr clone;
+    p->Clone(MakeRequest(&clone));
+    auto info = clone.PassInterface();
+    m->WriteUInt32(info.version());
+    MojoMessageHelper::WriteMessagePipeTo(m, info.PassHandle());
+  }
+}
+
+bool ParamTraits<storage::mojom::BlobPtr>::Read(const base::Pickle* m,
+                                                base::PickleIterator* iter,
+                                                param_type* r) {
+  bool is_valid;
+  if (!ReadParam(m, iter, &is_valid))
+    return false;
+  if (!is_valid)
+    return true;
+
+  uint32_t version;
+  if (!ReadParam(m, iter, &version))
+    return false;
+  mojo::ScopedMessagePipeHandle handle;
+  if (!MojoMessageHelper::ReadMessagePipeFrom(m, iter, &handle))
+    return false;
+  DCHECK(handle.is_valid());
+  r->Bind(
+      mojo::InterfacePtrInfo<storage::mojom::Blob>(std::move(handle), version));
+  return true;
+}
+
+void ParamTraits<storage::mojom::BlobPtr>::Log(const param_type& p,
+                                               std::string* l) {}
+
 }  // namespace IPC
 
 // Generate param traits size methods.