Adds hook for content embedders to get media::BrowserCdm*.

content/browser/media/cdm/browser_cdm_manager.cc

 // 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.
 
 #include "content/browser/media/cdm/browser_cdm_manager.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 166 matching lines @@
     IPC_MESSAGE_HANDLER(CdmHostMsg_CreateSessionAndGenerateRequest,
                         OnCreateSessionAndGenerateRequest)
     IPC_MESSAGE_HANDLER(CdmHostMsg_UpdateSession, OnUpdateSession)
     IPC_MESSAGE_HANDLER(CdmHostMsg_CloseSession, OnCloseSession)
     IPC_MESSAGE_HANDLER(CdmHostMsg_DestroyCdm, OnDestroyCdm)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
-media::BrowserCdm* BrowserCdmManager::GetCdm(int render_frame_id, int cdm_id) {
+media::BrowserCdm* BrowserCdmManager::GetCdm(int render_frame_id,
+                                             int cdm_id) const {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
   return cdm_map_.get(GetId(render_frame_id, cdm_id));
 }
 
 void BrowserCdmManager::RenderFrameDeleted(int render_frame_id) {
   if (!task_runner_->RunsTasksOnCurrentThread()) {
     task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&BrowserCdmManager::RemoveAllCdmForFrame,
                    this, render_frame_id));
@@ skipping 349 matching lines @@
   }
 
   // Only the temporary session type is supported in browser CDM path.
   // TODO(xhwang): Add SessionType support if needed.
   cdm->CreateSessionAndGenerateRequest(media::MediaKeys::TEMPORARY_SESSION,
                                        init_data_type, &init_data[0],
                                        init_data.size(), promise.Pass());
 }
 
 }  // namespace content