Implement the file chooser as a new resource "host"

ppapi/proxy/plugin_dispatcher.cc

Index: ppapi/proxy/plugin_dispatcher.cc
diff --git a/ppapi/proxy/plugin_dispatcher.cc b/ppapi/proxy/plugin_dispatcher.cc
index 9cf606e2571198c45e07522dd2dc57fa7becbe01..931471354e3e14239a534b3dde3bbd01c7876aa4 100644
--- a/ppapi/proxy/plugin_dispatcher.cc
+++ b/ppapi/proxy/plugin_dispatcher.cc
@@ -23,6 +23,8 @@
 #include "ppapi/proxy/ppb_instance_proxy.h"
 #include "ppapi/proxy/ppp_class_proxy.h"
 #include "ppapi/proxy/resource_creation_proxy.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/proxy_lock.h"
 #include "ppapi/shared_impl/resource.h"
 
@@ -189,10 +191,12 @@ bool PluginDispatcher::OnMessageReceived(const IPC::Message& msg) {
   TRACE_EVENT2("ppapi proxy", "PluginDispatcher::OnMessageReceived",
                "Class", IPC_MESSAGE_ID_CLASS(msg.type()),
                "Line", IPC_MESSAGE_ID_LINE(msg.type()));
+
   if (msg.routing_id() == MSG_ROUTING_CONTROL) {
     // Handle some plugin-specific control messages.
     bool handled = true;
     IPC_BEGIN_MESSAGE_MAP(PluginDispatcher, msg)
+      IPC_MESSAGE_HANDLER(PpapiPluginMsg_ResourceReply, OnMsgResourceReply)
       IPC_MESSAGE_HANDLER(PpapiMsg_SupportsInterface, OnMsgSupportsInterface)
       IPC_MESSAGE_HANDLER(PpapiMsg_SetPreferences, OnMsgSetPreferences)
       IPC_MESSAGE_UNHANDLED(handled = false);
@@ -271,6 +275,19 @@ void PluginDispatcher::ForceFreeAllInstances() {
   }
 }
 
+void PluginDispatcher::OnMsgResourceReply(
+    const ppapi::proxy::ResourceMessageReplyParams& reply_params,
+    const IPC::Message& nested_msg) {
+  Resource* resource = PpapiGlobals::Get()->GetResourceTracker()->GetResource(
+      reply_params.pp_resource());
+  if (!resource) {
+    NOTREACHED();
+    return;
+  }
+  resource->OnReplyReceived(reply_params.sequence(), reply_params.result(),
+                            nested_msg);
+}
+
 void PluginDispatcher::OnMsgSupportsInterface(
     const std::string& interface_name,
     bool* result) {