PPB_UDPSocket_Private is switched to the new Pepper proxy.

content/public/browser/browser_ppapi_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 
 #include "base/callback_forward.h"
 #include "base/process.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "googleurl/src/gurl.h"
 #include "ppapi/c/pp_instance.h"
 
 namespace IPC {
 class ChannelProxy;
 struct ChannelHandle;
 class Sender;
 }
 
@@ skipping 54 matching lines @@
 
   // Returns the name of the plugin.
   virtual const std::string& GetPluginName() = 0;
 
   // Returns the user's profile data directory.
   virtual const FilePath& GetProfileDataDirectory() = 0;
 
   // Get the Document/Plugin URLs for the given PP_Instance.
   virtual GURL GetDocumentURLForInstance(PP_Instance instance) = 0;
   virtual GURL GetPluginURLForInstance(PP_Instance instance) = 0;
+
+  // Schedules the given callback to execute on the UI thread of the browser,
+  // passing the RenderViewHost associated with the given instance as a
+  // parameter.
+  //
+  // Normally this would be called from a ResourceHost with the reply using
+  // a weak pointer to itself.
+  //
+  // Importantly, the task will not be run if the RenderView is destroyed by
+  // the time we get to the UI thread, or if the PP_Instance is invalid, but
+  // the reply will still be run. The return type in this case will be a
+  // default-constructed |ReturnType|.
+  //
+  // So you may want to make sure you don't do silly things in the reply
+  // handler if the task on the UI thread is never run and you get a
+  // default-constructed result.
+  template<typename ReturnType>
+  bool PostOnUIThreadWithRenderViewHostAndReply(

[dmichael (off chromium), 2013/01/10 17:30:47]

This is cool, but I think it probably doesn't belong here. For now, you could
just stick it in an unnamed namespace in pepper_udp_socket_private_host.cc, and
we can move it somewhere later if/when it gets used again. But in any case, I
think content/public should be kept minimal; this is kind of an internal
implementation detail.

[ygorshenin1, 2013/01/11 11:42:45]

OK, I'll move these methods to pepper_socket_utils.h. They're certainly will be
used by TCP and TCP server sockets.

On 2013/01/10 17:30:47, dmichael wrote:

+      const tracked_objects::Location& from_here,
+      PP_Instance instance,
+      const base::Callback<ReturnType(RenderViewHost*)>& task,
+      const base::Callback<void(ReturnType)>& reply) const {
+    int render_process_id, render_view_id;
+    bool success = GetRenderViewIDsForInstance(instance,
+                                               &render_process_id,
+                                               &render_view_id);
+    if (!success)
+      return false;
+    BrowserThread::PostTaskAndReplyWithResult(
+        BrowserThread::UI,
+        from_here,
+        base::Bind(&CallWithRenderViewHost<ReturnType>,
+                   render_process_id, render_view_id, task),
+        reply);
+    return true;
+  }
+
+ protected:
+  // Backend for PostOnUIThreadWithRenderViewAndReply. This converts the IDs
+  // to a RenderViewHost and calls the function, or returns a
+  // default-constructed return value on error.
+  template<typename ReturnType>
+  static ReturnType CallWithRenderViewHost(
+      int render_process_id,
+      int render_view_id,
+      const base::Callback<ReturnType(RenderViewHost*)>& task) {
+    RenderViewHost* render_view_host = RenderViewHost::FromID(render_process_id,
+                                                              render_view_id);
+    if (render_view_host)
+      return task.Run(render_view_host);
+    return ReturnType();
+  }
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_