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 c5c4f292dc25661107d5e8fbec352fe262452c56..c28aaff56a24c69c8426e0fbfe9b8505d39f6bad 100644
--- a/content/renderer/browser_plugin/browser_plugin.cc
+++ b/content/renderer/browser_plugin/browser_plugin.cc
@@ -72,6 +72,7 @@ BrowserPlugin::BrowserPlugin(
       navigate_src_sent_(false),
       process_id_(-1),
       persist_storage_(false),
+      guest_routing_id_(MSG_ROUTING_NONE),
       visible_(true) {
   BrowserPluginManager::Get()->AddBrowserPlugin(instance_id, this);
   bindings_.reset(new BrowserPluginBindings(this));
@@ -140,6 +141,17 @@ void BrowserPlugin::SetSrcAttribute(const std::string& src) {
   guest_crashed_ = false;
 }
 
+NPObject* BrowserPlugin::GetContentWindow() const {
+  if (guest_routing_id_ == MSG_ROUTING_NONE)
+    return NULL;
+  RenderViewImpl* guest_render_view = static_cast<RenderViewImpl*>(
+    ChildThread::current()->ResolveRoute(guest_routing_id_));

[Charlie Reis, 2012/10/12 00:31:43]

nit: wrong indent.

[Fady Samuel, 2012/10/12 18:07:53]

Done.

+  if (!guest_render_view)
+    return NULL;
+  WebKit::WebFrame* guest_frame = guest_render_view->GetWebView()->mainFrame();
+  return guest_frame->windowObject();

[Charlie Reis, 2012/10/12 00:31:43]

This is beyond my knowledge.  Is it safe to return a NPObject*?  Do we need to
document the dangers of it?  (I'm hoping to avoid similar issues like we saw
with the v8 event stuff.)

[Fady Samuel, 2012/10/12 18:07:53]

I will ask abarth@ to at a look at BrowserPlugin::GetContentWindow. Thanks.

+}
+
 std::string BrowserPlugin::GetPartitionAttribute() const {
   std::string value;
   if (persist_storage_)
@@ -469,6 +481,11 @@ void BrowserPlugin::AdvanceFocus(bool reverse) {
     render_view_->GetWebView()->advanceFocus(reverse);
 }
 
+void BrowserPlugin::GuestContentWindowReady(int guest_routing_id) {
+  DCHECK(guest_routing_id != MSG_ROUTING_NONE);
+  guest_routing_id_ = guest_routing_id;
+}
+
 void BrowserPlugin::SetAcceptTouchEvents(bool accept) {
   if (container())
     container()->setIsAcceptingTouchEvents(accept);