Convert the async device ID getter to a chrome resource host

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
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 // process. This ID is valid only in the context of the browser process and is
 // used to identify the proper process when the renderer notifies it that the
 // plugin is hung.
 //
 // On error an empty string and null handles are returned.
 IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_OpenChannelToPepperPlugin,
                             FilePath /* path */,
                             IPC::ChannelHandle /* handle to channel */,
                             int /* plugin_child_id */)
 
+// Notification that a native (non-NaCl) plugin has created a new plugin
+// instance. The parameters indicate the plugin process ID that we're creating
+// the instance for, and the routing ID of the render view that the plugin
+// instance is associated with. This allows us to create a mapping in the
+// browser process for what objects a given PP_Instance is associated with.
+//
+// This message must be sync even though it returns no parameters to avoid
+// a race condition with the plugin process. The plugin process sends messages
+// to the browser that assume the browser knows about the instance. We need to
+// sure that the browser actually knows about the instance before we tell the
+// plugin to run.
+IPC_SYNC_MESSAGE_CONTROL3_0(ViewHostMsg_DidCreateOutOfProcessPepperInstance,
+                            int /* plugin_child_id */,
+                            int32 /* pp_instance */,
+                            int /* view_routing_id */)
+
+// Notification that a native (non-NaCl) plugin has destroyed an instance. This
+// is the opposite if the "DidCreate" version above.
+IPC_MESSAGE_CONTROL2(ViewHostMsg_DidDeleteOutOfProcessPepperInstance,
+                     int /* plugin_child_id */,
+                     int32 /* pp_instance */)
+
 // A renderer sends this to the browser process when it wants to
 // create a ppapi broker.  The browser will create the broker process
 // if necessary, and will return a handle to the channel on success.
 // On error an empty string is returned.
 // The browser will respond with ViewMsg_PpapiBrokerChannelCreated.
 IPC_MESSAGE_CONTROL3(ViewHostMsg_OpenChannelToPpapiBroker,
                      int /* routing_id */,
                      int /* request_id */,
                      FilePath /* path */)
 
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 // custom normalized fractions of the document size. The rects will be sorted by
 // frame traversal order starting in the main frame, then by dom order.
 //
 // |active_rect| will contain the bounding box of the active find-in-page match
 // marker, in similarly normalized coords (or an empty rect if there isn't one).
 IPC_MESSAGE_ROUTED3(ViewHostMsg_FindMatchRects_Reply,
                     int /* version */,
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 #endif