Convert the async device ID getter to a chrome resource host

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_view_host.h"
+#include "ppapi/c/pp_instance.h"
 
 namespace ppapi {
 namespace host {
 class PpapiHost;
 }
 }
 
 namespace content {
 
 // Interface that allows components in the embedder app to talk to the
 // PpapiHost in the browser process.
 //
 // There will be one of these objects in the browser per plugin process. It
 // lives entirely on the I/O thread.
 class CONTENT_EXPORT BrowserPpapiHost {
  public:
   // Returns the PpapiHost object.
   virtual ppapi::host::PpapiHost* GetPpapiHost() = 0;
 
   // Returns the handle to the plugin process.
   virtual base::ProcessHandle GetPluginProcessHandle() const = 0;
 
+  // Returns true if the given PP_Instance is valid.
+  virtual bool IsValidInstance(PP_Instance instance) const = 0;
+
+  // Retrieves the process/view Ids associated with the RenderView containing
+  // the given instance and returns true on success. If the instance is
+  // invalid, the ids will be 0 and false will be returned.
+  //
+  // When a resource is created, the PP_Instance should already have been
+  // validated, and the resource hosts will be deleted when the resource is
+  // destroyed. So it should not generally be necessary to check for errors
+  // from this function except as a last-minute sanity check if you convert the
+  // IDs to a RenderView/ProcessHost on the UI thread.
+  virtual bool GetRenderViewIDsForInstance(PP_Instance instance,
+                                           int* render_process_id,
+                                           int* render_view_id) const = 0;
+
  protected:
   virtual ~BrowserPpapiHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_