Make video codec support logic overridable via MediaClient

content/renderer/media/render_media_client.h

Index: content/renderer/media/render_media_client.h
diff --git a/content/renderer/media/render_media_client.h b/content/renderer/media/render_media_client.h
index 1d5d3457a129b44cad20698d327cb545d8a60b96..8f793d9652e9080edabdf9d3f7859d3bb69f1a27 100644
--- a/content/renderer/media/render_media_client.h
+++ b/content/renderer/media/render_media_client.h
@@ -32,6 +32,9 @@ class CONTENT_EXPORT RenderMediaClient : public media::MediaClient {
       std::vector<std::unique_ptr<media::KeySystemProperties>>*
           key_systems_properties) final;
   void RecordRapporURL(const std::string& metric, const GURL& url) final;
+  bool IsSupportedVideoConfig(media::VideoCodec codec,
+                              media::VideoCodecProfile profile,
+                              int level) override;
 
   void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);