Move responsibility for RTP header extensions on video receive.

webrtc/pc/mediacontroller.cc

Index: webrtc/pc/mediacontroller.cc
diff --git a/webrtc/pc/mediacontroller.cc b/webrtc/pc/mediacontroller.cc
index fa8acadddcc5229b7126c4b4c2c9cdc7b34b25fb..ead69ad1044de0cdb4bcd2a641dd77712e3578ae 100644
--- a/webrtc/pc/mediacontroller.cc
+++ b/webrtc/pc/mediacontroller.cc
@@ -63,6 +63,20 @@ class MediaController : public webrtc::MediaControllerInterface,
   }
   const cricket::MediaConfig& config() const override { return media_config_; }
 
+  // Call's SetVideoReceiveRtpHeaderExtensions can be called on any thread,
+  // but we need to go via worker_thread_ to access the call_ pointer.
+  void SetVideoReceiveRtpHeaderExtensions(
+      const std::vector<webrtc::RtpExtension>& extensions) override {
+    if (!worker_thread_->IsCurrent()) {
+      worker_thread_->Invoke<void>(
+          RTC_FROM_HERE,
+          rtc::Bind(&MediaController::SetVideoReceiveRtpHeaderExtensions,
+                    this, extensions));
+      return;
+    }
+    call_w()->SetVideoReceiveRtpHeaderExtensions(extensions);
+  }
+
  private:
   void Construct_w(cricket::MediaEngineInterface* media_engine) {
     RTC_DCHECK(worker_thread_->IsCurrent());