Implement the file chooser as a new resource "host"

ppapi/proxy/host_dispatcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/host_dispatcher.h"
 
 #include <map>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 165 matching lines @@
                "Line", IPC_MESSAGE_ID_LINE(msg.type()));
   // We only want to allow reentrancy when the most recent message from the
   // plugin was a scripting message. We save the old state of the flag on the
   // stack in case we're (we are the host) being reentered ourselves. The flag
   // is set to false here for all messages, and then the scripting API will
   // explicitly set it to true during processing of those messages that can be
   // reentered.
   BoolRestorer restorer(&allow_plugin_reentrancy_);
   allow_plugin_reentrancy_ = false;
 
+  for (size_t i = 0; i < filters_.size(); i++) {
+    if (filters_[i]->OnMessageReceived(msg))
+      return true;
+  }
+
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(HostDispatcher, msg)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_LogWithSource, OnHostMsgLogWithSource)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   if (handled)
     return true;
   return Dispatcher::OnMessageReceived(msg);
 }
@@ skipping 59 matching lines @@
   }
 }
 
 ScopedModuleReference::~ScopedModuleReference() {
   if (dispatcher_)
     dispatcher_->ppb_proxy()->ReleaseModule(dispatcher_->pp_module());
 }
 
 }  // namespace proxy
 }  // namespace ppapi