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

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index b74e38f20592baff448d2e28209a38cd98abdb02..e5e60dc0bd7df39e92510213bb5d04840ec01330 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -30,6 +30,7 @@ union ValueState;
 
 namespace media {
 class AudioOutputController;
+class BrowserCdm;
 }
 
 namespace content {
@@ -271,6 +272,13 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   virtual void GetAudioOutputControllers(
       const GetAudioOutputControllersCallback& callback) const = 0;
 
+#if defined(ENABLE_BROWSER_CDMS)
+  // Returns the ::media::BrowserCdm instance associated with |render_frame_id|
+  // and |cdm_id|, or nullptr if not found.
+  virtual media::BrowserCdm* GetBrowserCdm(int render_frame_id,
+                                           int cdm_id) const = 0;
+#endif
+
   // Static management functions -----------------------------------------------
 
   // Flag to run the renderer in process.  This is primarily