Browser Plugin: Add HTML5-like postMessage support

content/renderer/browser_plugin/browser_plugin.cc

Index: content/renderer/browser_plugin/browser_plugin.cc
diff --git a/content/renderer/browser_plugin/browser_plugin.cc b/content/renderer/browser_plugin/browser_plugin.cc
index 44d452cc8eb6ea7b12c71c5d5df5b01e37781845..83584af332390f2d153d6757aef61c6b04701847 100644
--- a/content/renderer/browser_plugin/browser_plugin.cc
+++ b/content/renderer/browser_plugin/browser_plugin.cc
@@ -41,6 +41,7 @@ namespace content {
 
 namespace {
 const char kCrashEventName[] = "crash";
+const char kMessageEventName[] = "message";

[nasko, 2012/09/19 21:19:59]

This doesn't seem to be used anywhere.

[Fady Samuel, 2012/09/20 15:24:28]

Done.

 const char kNavigationEventName[] = "navigation";
 const char* kSrcAttribute = "src";
 }
@@ -240,6 +241,37 @@ void BrowserPlugin::AdvanceFocus(bool reverse) {
     render_view_->GetWebView()->advanceFocus(reverse);
 }
 
+void BrowserPlugin::PostMessage(const string16& message,
+                                const string16& target_origin) {
+  BrowserPluginManager::Get()->Send(new BrowserPluginHostMsg_RouteMessageEvent(
+      render_view_->GetRoutingID(),
+      instance_id_,
+      message,
+      target_origin));
+}
+
+void BrowserPlugin::ReceiveMessage(int source_routing_id,
+                                   const string16& source_origin,
+                                   const string16& data) {
+  // This is a swapped out RenderViewImpl for the guest in the embedder process.
+  WebKit::WebFrame* source_frame = NULL;
+  if (source_routing_id != MSG_ROUTING_NONE) {
+    RenderViewImpl* source_render_view = static_cast<RenderViewImpl*>(
+      ChildThread::current()->ResolveRoute(source_routing_id));
+    source_frame = source_render_view->webview()->mainFrame();

[nasko, 2012/09/19 21:19:59]

It will be useful to put a comment that we only work with top-level frames in
the case of browser tag, unlike the regular web.

[Fady Samuel, 2012/09/20 15:24:28]

Done.

+  }
+  WebKit::WebFrame* target_frame = render_view_->webview()->mainFrame();
+  WebKit::WebDOMEvent event =
+      target_frame->document().createEvent("MessageEvent");
+  WebKit::WebDOMMessageEvent msg_event = event.to<WebKit::WebDOMMessageEvent>();
+  msg_event.initMessageEvent("message",
+                             // |canBubble| and |cancellable| are always false
+                             false, false,
+                             WebKit::WebSerializedScriptValue::fromString(data),
+                             source_origin, source_frame, "");
+  container()->element().dispatchEvent(msg_event);

[nasko, 2012/09/19 21:19:59]

Also, a comment why we are not doing an origin check will be good to have.

[Fady Samuel, 2012/09/20 15:24:28]

Added. I posed it as a TODO/question.

+}
+
 bool BrowserPlugin::HasListeners(const std::string& event_name) {
   return event_listener_map_.find(event_name) != event_listener_map_.end();
 }