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 6139b839c0b5fb59bee0e1fcb2196686c49dbba4..d74cab257971e1b62ac179fef9e0ecb65efbfebc 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),
+      content_window_routing_id_(MSG_ROUTING_NONE),
       visible_(true),
       current_nav_entry_index_(0),
       nav_entry_count_(0) {
@@ -134,6 +135,17 @@ void BrowserPlugin::SetSrcAttribute(const std::string& src) {
   src_ = src;
 }
 
+NPObject* BrowserPlugin::GetContentWindow() const {
+  if (content_window_routing_id_ == MSG_ROUTING_NONE)
+    return NULL;
+  RenderViewImpl* guest_render_view = static_cast<RenderViewImpl*>(
+      ChildThread::current()->ResolveRoute(content_window_routing_id_));
+  if (!guest_render_view)
+    return NULL;
+  WebKit::WebFrame* guest_frame = guest_render_view->GetWebView()->mainFrame();
+  return guest_frame->windowObject();
+}
+
 std::string BrowserPlugin::GetPartitionAttribute() const {
   std::string value;
   if (persist_storage_)
@@ -486,6 +498,11 @@ void BrowserPlugin::AdvanceFocus(bool reverse) {
     render_view_->GetWebView()->advanceFocus(reverse);
 }
 
+void BrowserPlugin::GuestContentWindowReady(int content_window_routing_id) {
+  DCHECK(content_window_routing_id != MSG_ROUTING_NONE);
+  content_window_routing_id_ = content_window_routing_id;
+}
+
 void BrowserPlugin::SetAcceptTouchEvents(bool accept) {
   if (container())
     container()->setIsAcceptingTouchEvents(accept);