fix for b/4126624 Widevine DRM client not sending heartbeats

Added some missing parameters to the heartbeat message, found in end-to-end
testing with youtube.  Also enabled heartbeats on client builds.

Change-Id: I445fb0cb168e63a041f0ecf828eaad493143a648

proprietary/wvm/WVMExtractorImpl.cpp

@@ -107,12 +107,7 @@ WVMExtractorImpl::WVMExtractorImpl(sp<DataSource> dataSource)
     // Set an info listener to handle messages from the drm plugin
     mInfoListener = new WVMInfoListener();
 
-// Change #if 0 to #if 1 to enable heartbeats.  Since the heartbeat server
-// is not yet returning valid responses, this will cause the player to
-// fail with an error, until the heartbeat server is working correctly.
-#if 0
     sDrmManagerClient->setOnInfoListener(mInfoListener);
-#endif
 
     WVStatus result = WV_Initialize(NULL);
     if (result != WV_Status_OK) {