Browser Plugin: Add HTML5-like postMessage support

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 8337c0a1183384c012b1f5c1d51972ced302a20a..c42922b0119ad8aee76dce8faed0d69fafccce7e 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -41,7 +41,9 @@ BrowserPluginGuest::BrowserPluginGuest(int instance_id,
       damage_buffer_scale_factor_(1.0f),
       pending_update_counter_(0),
       guest_hang_timeout_(
-          base::TimeDelta::FromMilliseconds(kGuestHangTimeoutMs)) {
+          base::TimeDelta::FromMilliseconds(kGuestHangTimeoutMs)),
+      swapped_out_embedder_routing_id_(MSG_ROUTING_NONE),
+      swapped_out_guest_routing_id_(MSG_ROUTING_NONE) {
   DCHECK(web_contents);
   // |render_view_host| manages the ownership of this BrowserPluginGuestHelper.
   new BrowserPluginGuestHelper(this, render_view_host);
@@ -228,6 +230,18 @@ void BrowserPluginGuest::HandleInputEvent(RenderViewHost* render_view_host,
   guest_rvh->StartHangMonitorTimeout(guest_hang_timeout_);
 }
 
+void BrowserPluginGuest::RouteMessageEvent(
+    const ViewMsg_PostMessage_Params& params) {
+  BrowserPluginMsg_ReceiveMessage_Params out_params;
+  out_params.source_routing_id = swapped_out_embedder_routing_id();
+  out_params.source_origin = params.source_origin;
+  out_params.source_frame_id = params.source_frame_id;
+  out_params.target_frame_id = params.target_frame_id;
+  out_params.data = params.data;
+  SendMessageToEmbedder(
+      new BrowserPluginMsg_ReceiveMessage(instance_id(), out_params));
+}
+
 void BrowserPluginGuest::HandleInputEventAck(RenderViewHost* render_view_host,
                                              bool handled) {
   RenderViewHostImpl* guest_rvh =