[Chromecast] Allow CMA backend to notify of key expiry

chromecast/media/cma/pipeline/media_pipeline_impl.cc

Index: chromecast/media/cma/pipeline/media_pipeline_impl.cc
diff --git a/chromecast/media/cma/pipeline/media_pipeline_impl.cc b/chromecast/media/cma/pipeline/media_pipeline_impl.cc
index da9b07526797726744b77e2cc0162d76a48909e6..0c1261e09f36a5736e2c375ca41088503beb91e7 100644
--- a/chromecast/media/cma/pipeline/media_pipeline_impl.cc
+++ b/chromecast/media/cma/pipeline/media_pipeline_impl.cc
@@ -155,6 +155,15 @@ void MediaPipelineImpl::OnDecoderError(MediaPipelineBackend::Decoder* decoder) {
   }
 }
 
+void MediaPipelineImpl::OnKeyStatusChanged(const std::string& key_id,
+                                           CastKeyStatus key_status,
+                                           uint32_t system_code) {
+  CMALOG(kLogControl) << __FUNCTION__;
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (cdm_)

[yucliu1, 2015/11/18 01:06:36]

Is it possible for !cdm_ happen? If this did happen, I think we need to fire it
later when cdm_ is ready. Otherwise, add a DCHECK here?

[halliwell, 2015/11/18 02:32:18]

Agreed, I don't think it's possible.  A key can only change status if we are
using a CDM in the first place.  Changed to a DCHECK.

+    cdm_->SetKeyStatus(key_id, key_status, system_code);
+}
+
 void MediaPipelineImpl::SetCdm(BrowserCdmCast* cdm) {
   CMALOG(kLogControl) << __FUNCTION__;
   DCHECK(thread_checker_.CalledOnValidThread());