Put the RenderFrame's ID into a per-frame WebBluetooth, and plumb that back to the browser.

content/browser/bluetooth/bluetooth_dispatcher_host.h

 // Copyright 2014 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_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/browser_message_filter.h"
@@ skipping 16 matching lines @@
 // a filter on the channel. BrowserMessageFilter is refcounted and typically
 // lives as long as it is installed on a channel.
 //
 // UI Thread Note:
 // BluetoothDispatcherHost is constructed, operates, and destroyed on the UI
 // thread because BluetoothAdapter and related objects live there.
 class CONTENT_EXPORT BluetoothDispatcherHost final
     : public BrowserMessageFilter,
       public device::BluetoothAdapter::Observer {
  public:
-  BluetoothDispatcherHost();
+  BluetoothDispatcherHost(int render_process_id);
   // BrowserMessageFilter:
   void OnDestruct() const override;
   void OverrideThreadForMessage(const IPC::Message& message,
                                 BrowserThread::ID* thread) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void SetBluetoothAdapterForTesting(
       scoped_refptr<device::BluetoothAdapter> mock_adapter);
 
  protected:
   ~BluetoothDispatcherHost() override;
 
  private:
   friend class base::DeleteHelper<BluetoothDispatcherHost>;
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
 
   struct RequestDeviceSession;
 
   // Set |adapter_| to a BluetoothAdapter instance and register observers,
   // releasing references to previous |adapter_|.
   void set_adapter(scoped_refptr<device::BluetoothAdapter> adapter);
 
   // IPC Handlers, see definitions in bluetooth_messages.h.
   void OnRequestDevice(
       int thread_id,
       int request_id,
+      int frame_routing_id,
       const std::vector<content::BluetoothScanFilter>& filters,
       const std::vector<device::BluetoothUUID>& optional_services);
   void OnConnectGATT(int thread_id, int request_id,
                      const std::string& device_instance_id);
   void OnGetPrimaryService(int thread_id,
                            int request_id,
                            const std::string& device_instance_id,
                            const std::string& service_uuid);
   void OnGetCharacteristic(int thread_id,
                            int request_id,
@@ skipping 52 matching lines @@
       int thread_id,
       int request_id,
       device::BluetoothGattService::GattErrorCode);
 
   // Callbacks for BluetoothGattCharacteristic::WriteRemoteCharacteristic.
   void OnWriteValueSuccess(int thread_id, int request_id);
   void OnWriteValueFailed(int thread_id,
                           int request_id,
                           device::BluetoothGattService::GattErrorCode);
 
+  int render_process_id_;
+
   // Maps a (thread_id,request_id) to information about its requestDevice call,
   // including the chooser dialog.
   // An entry is added to this map in OnRequestDevice, and should be removed
   // again everywhere a requestDevice() reply is sent.
   std::map<std::pair<int, int>, RequestDeviceSession> request_device_sessions_;
 
   // Maps to get the object's parent based on it's instanceID
   // Map of service_instance_id to device_instance_id.
   std::map<std::string, std::string> service_to_device_;
   // Map of characteristic_instance_id to service_instance_id.
   std::map<std::string, std::string> characteristic_to_service_;
 
   // Defines how long to scan for and how long to discover services for.
   int current_delay_time_;
 
   // A BluetoothAdapter instance representing an adapter of the system.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
   // Must be last member, see base/memory/weak_ptr.h documentation
   base::WeakPtrFactory<BluetoothDispatcherHost> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_