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

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index f65e7d757ee4a1cebd2a5af25e26705d83d3bd95..054a3d2d7703e72d941ecbe8ce5689cd33e895f6 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -149,6 +149,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void OnRemoveSubscription(unsigned int target) override;
   void SendUpdateValueState(
       unsigned int target, const gpu::ValueState& state) override;
+#if defined(ENABLE_BROWSER_CDMS)
+  media::BrowserCdm* GetBrowserCdm(int render_frame_id,
+                                   int cdm_id) const override;
+#endif
 
   // IPC::Sender via RenderProcessHost.
   bool Send(IPC::Message* msg) override;