Replace JSON (de)serialization of extension messages with direct Value pickling.

chrome/renderer/extensions/miscellaneous_bindings.cc

Index: chrome/renderer/extensions/miscellaneous_bindings.cc
diff --git a/chrome/renderer/extensions/miscellaneous_bindings.cc b/chrome/renderer/extensions/miscellaneous_bindings.cc
index d40d517ed4ee8e18adb792a68adadd630f689296..d7e591dc1fbcb940a5e4595bf2c59025db333ed4 100644
--- a/chrome/renderer/extensions/miscellaneous_bindings.cc
+++ b/chrome/renderer/extensions/miscellaneous_bindings.cc
@@ -95,43 +95,65 @@ class ExtensionImpl : public extensions::ChromeV8Extension {
     if (!renderview)
       return v8::Undefined();
 
-    if (args.Length() >= 2 && args[0]->IsInt32() && args[1]->IsString()) {
-      int port_id = args[0]->Int32Value();
-      if (!HasPortData(port_id)) {
-        return v8::ThrowException(v8::Exception::Error(
-          v8::String::New(kPortClosedError)));
-      }
-      std::string message = *v8::String::Utf8Value(args[1]->ToString());
-      renderview->Send(new ExtensionHostMsg_PostMessage(
-          renderview->GetRoutingID(), port_id, message));
+    // Arguments are (int32 port_id, object message).
+    CHECK_EQ(2, args.Length());
+    CHECK(args[0]->IsInt32());
+
+    int port_id = args[0]->Int32Value();
+    if (!HasPortData(port_id)) {
+      return v8::ThrowException(v8::Exception::Error(
+        v8::String::New(kPortClosedError)));
     }
+
+    // The message can be any base::Value but IPC can't serialize that, so we
+    // give it a singleton base::ListValue instead, or an empty list if the
+    // argument was undefined (v8 value converter will return NULL for this).
+    scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
+    scoped_ptr<base::Value> message(
+        converter->FromV8Value(args[1], v8_context()));
+    ListValue message_as_list;
+    if (message)
+      message_as_list.Append(message.release());
+
+    renderview->Send(new ExtensionHostMsg_PostMessage(
+        renderview->GetRoutingID(), port_id, message_as_list));
+
     return v8::Undefined();
   }
 
   // Forcefully disconnects a port.
   v8::Handle<v8::Value> CloseChannel(const v8::Arguments& args) {
-    if (args.Length() >= 2 && args[0]->IsInt32() && args[1]->IsBoolean()) {
-      int port_id = args[0]->Int32Value();
-      if (!HasPortData(port_id)) {
-        return v8::Undefined();
-      }
-      // Send via the RenderThread because the RenderView might be closing.
-      bool notify_browser = args[1]->BooleanValue();
-      if (notify_browser)
-        content::RenderThread::Get()->Send(
-            new ExtensionHostMsg_CloseChannel(port_id, std::string()));
-      ClearPortData(port_id);
+    // Arguments are (int32 port_id, boolean notify_browser).
+    CHECK_EQ(2, args.Length());
+    CHECK(args[0]->IsInt32());
+    CHECK(args[1]->IsBoolean());
+
+    int port_id = args[0]->Int32Value();
+    if (!HasPortData(port_id))
+      return v8::Undefined();
+
+    // Send via the RenderThread because the RenderView might be closing.
+    bool notify_browser = args[1]->BooleanValue();
+    if (notify_browser) {
+      content::RenderThread::Get()->Send(
+          new ExtensionHostMsg_CloseChannel(port_id, std::string()));
     }
+
+    ClearPortData(port_id);
+
     return v8::Undefined();
   }
 
   // A new port has been created for a context.  This occurs both when script
   // opens a connection, and when a connection is opened to this script.
   v8::Handle<v8::Value> PortAddRef(const v8::Arguments& args) {
-    if (args.Length() >= 1 && args[0]->IsInt32()) {
-      int port_id = args[0]->Int32Value();
-      ++GetPortData(port_id).ref_count;
-    }
+    // Arguments are (int32 port_id).
+    CHECK_EQ(1, args.Length());
+    CHECK(args[0]->IsInt32());
+
+    int port_id = args[0]->Int32Value();
+    ++GetPortData(port_id).ref_count;
+
     return v8::Undefined();
   }
 
@@ -139,15 +161,18 @@ class ExtensionImpl : public extensions::ChromeV8Extension {
   // frames with a reference to a given port, we will disconnect it and notify
   // the other end of the channel.
   v8::Handle<v8::Value> PortRelease(const v8::Arguments& args) {
-    if (args.Length() >= 1 && args[0]->IsInt32()) {
-      int port_id = args[0]->Int32Value();
-      if (HasPortData(port_id) && --GetPortData(port_id).ref_count == 0) {
-        // Send via the RenderThread because the RenderView might be closing.
-        content::RenderThread::Get()->Send(
-            new ExtensionHostMsg_CloseChannel(port_id, std::string()));
-        ClearPortData(port_id);
-      }
+    // Arguments are (int32 port_id).
+    CHECK_EQ(1, args.Length());
+    CHECK(args[0]->IsInt32());
+
+    int port_id = args[0]->Int32Value();
+    if (HasPortData(port_id) && --GetPortData(port_id).ref_count == 0) {
+      // Send via the RenderThread because the RenderView might be closing.
+      content::RenderThread::Get()->Send(
+          new ExtensionHostMsg_CloseChannel(port_id, std::string()));
+      ClearPortData(port_id);
     }
+
     return v8::Undefined();
   }
 
@@ -271,7 +296,7 @@ void MiscellaneousBindings::DispatchOnConnect(
 void MiscellaneousBindings::DeliverMessage(
     const ChromeV8ContextSet::ContextSet& contexts,
     int target_port_id,
-    const std::string& message,
+    const base::ListValue& message,
     content::RenderView* restrict_to_render_view) {
   v8::HandleScope handle_scope;
 
@@ -282,6 +307,9 @@ void MiscellaneousBindings::DeliverMessage(
       continue;
     }
 
+    v8::Handle<v8::Context> context = (*it)->v8_context();
+    v8::Context::Scope context_scope(context);
+
     // Check to see whether the context has this port before bothering to create
     // the message.
     v8::Handle<v8::Value> port_id_handle = v8::Integer::New(target_port_id);
@@ -302,7 +330,19 @@ void MiscellaneousBindings::DeliverMessage(
       continue;
 
     std::vector<v8::Handle<v8::Value> > arguments;
-    arguments.push_back(v8::String::New(message.c_str(), message.size()));
+
+    // Convert the message to a v8 object; either a value or undefined.
+    // See PostMessage for more details.
+    if (message.empty()) {
+      arguments.push_back(v8::Undefined());
+    } else {
+      CHECK_EQ(1u, message.GetSize());
+      const base::Value* message_value = NULL;
+      message.Get(0, &message_value);
+      scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
+      arguments.push_back(converter->ToV8Value(message_value, context));
+    }
+
     arguments.push_back(port_id_handle);
     CHECK((*it)->CallChromeHiddenMethod("Port.dispatchOnMessage",
                                         arguments.size(),