Add flag in device enumeration request to control label clearing and don't clear for pepper.

content/renderer/media/media_stream_dispatcher_unittest.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 <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 208 matching lines @@
   scoped_ptr<MockMediaStreamDispatcherEventHandler>
       handler1(new MockMediaStreamDispatcherEventHandler);
   scoped_ptr<MockMediaStreamDispatcherEventHandler>
       handler2(new MockMediaStreamDispatcherEventHandler);
   GURL security_origin;
 
   int ipc_request_id1 = dispatcher->next_ipc_id_;
   dispatcher->EnumerateDevices(
       kRequestId1, handler1.get()->AsWeakPtr(),
       kVideoType,
-      security_origin);
+      security_origin,
+      false);
   int ipc_request_id2 = dispatcher->next_ipc_id_;
   EXPECT_NE(ipc_request_id1, ipc_request_id2);
   dispatcher->EnumerateDevices(
       kRequestId2, handler2.get()->AsWeakPtr(),
       kVideoType,
-      security_origin);
+      security_origin,
+      false);
   EXPECT_EQ(dispatcher->requests_.size(), size_t(2));
 
   StreamDeviceInfoArray video_device_array(1);
   StreamDeviceInfo video_device_info;
   video_device_info.device.name = "Camera";
   video_device_info.device.id = "device_path";
   video_device_info.device.type = kVideoType;
   video_device_info.session_id = kVideoSessionId;
   video_device_array[0] = video_device_info;
 
@@ skipping 156 matching lines @@
   dispatcher_->OnMessageReceived(
       MediaStreamMsg_DeviceStopped(kRouteId, label, handler_->video_device_));
   // Verify that MediaStreamDispatcherEventHandler::OnDeviceStopped has been
   // called.
   EXPECT_EQ(label, handler_->device_stopped_label_);
   EXPECT_EQ(dispatcher_->video_session_id(label, 0),
             StreamDeviceInfo::kNoId);
 }
 
 }  // namespace content