Send port disconnect events when a frame is unloaded.

chrome/renderer/extensions/renderer_extension_bindings.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/extensions/renderer_extension_bindings.h"
 
 #include "app/resource_bundle.h"
 #include "base/basictypes.h"
 #include "base/values.h"
 #include "chrome/common/render_messages.h"
@@ skipping 28 matching lines @@
                       arraysize(kExtensionDeps), kExtensionDeps) {
   }
   ~ExtensionImpl() {}
 
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name) {
     if (name->Equals(v8::String::New("OpenChannelToExtension"))) {
       return v8::FunctionTemplate::New(OpenChannelToExtension);
     } else if (name->Equals(v8::String::New("PostMessage"))) {
       return v8::FunctionTemplate::New(PostMessage);
+    } else if (name->Equals(v8::String::New("CloseChannel"))) {
+      return v8::FunctionTemplate::New(CloseChannel);
     }
     return ExtensionBase::GetNativeFunction(name);
   }
 
   // Creates a new messaging channel to the given extension.
   static v8::Handle<v8::Value> OpenChannelToExtension(
       const v8::Arguments& args) {
     // Get the current RenderView so that we can send a routed IPC message from
     // the correct source.
     RenderView* renderview = bindings_utils::GetRenderViewForCurrentContext();
@@ skipping 17 matching lines @@
       return v8::Undefined();
 
     if (args.Length() >= 2 && args[0]->IsInt32() && args[1]->IsString()) {
       int port_id = args[0]->Int32Value();
       std::string message = *v8::String::Utf8Value(args[1]->ToString());
       renderview->Send(new ViewHostMsg_ExtensionPostMessage(
           renderview->routing_id(), port_id, message));
     }
     return v8::Undefined();
   }
+
+  // Sends a message along the given channel.
+  static v8::Handle<v8::Value> CloseChannel(const v8::Arguments& args) {
+    if (args.Length() >= 1 && args[0]->IsInt32()) {
+      int port_id = args[0]->Int32Value();
+      // Send via the RenderThread because the RenderView might be closing.
+      EventBindings::GetRenderThread()->Send(
+          new ViewHostMsg_ExtensionCloseChannel(port_id));
+    }
+    return v8::Undefined();
+  }
 };
 
 // Convert a ListValue to a vector of V8 values.
 static std::vector< v8::Handle<v8::Value> > ListValueToV8(
     const ListValue& value) {
   std::vector< v8::Handle<v8::Value> > v8_values;
 
   for (size_t i = 0; i < value.GetSize(); ++i) {
     Value* elem = NULL;
     value.Get(i, &elem);
@@ skipping 42 matching lines @@
 v8::Extension* RendererExtensionBindings::Get() {
   return new ExtensionImpl();
 }
 
 void RendererExtensionBindings::Invoke(const std::string& function_name,
                                        const ListValue& args) {
   v8::HandleScope handle_scope;
   std::vector< v8::Handle<v8::Value> > argv = ListValueToV8(args);
   EventBindings::CallFunction(function_name, argv.size(), &argv[0]);
 }