Add flag to communicate last casted app to renderer process

chromecast/common/chromecast_switches.cc

Index: chromecast/common/chromecast_switches.cc
diff --git a/chromecast/common/chromecast_switches.cc b/chromecast/common/chromecast_switches.cc
index cb58d05774a5dfc67dd4abed0e1842a5d7d85e58..aca640d5bc98ac362b9af1873d473886a510c720 100644
--- a/chromecast/common/chromecast_switches.cc
+++ b/chromecast/common/chromecast_switches.cc
@@ -20,4 +20,12 @@ const char kOverrideMetricsUploadUrl[] = "override-metrics-upload-url";
 // Disable features that require WiFi management.
 const char kNoWifi[] = "no-wifi";
 
+// Pass the app id information to the renderer process, to be used for logging.
+// last-launched-app should be the app that just launched and is spawning the
+// renderer.
+const char kLastLaunchedApp[] = "last-launched-app";
+// previous-app should be the app that was running when last-launched-app
+// started.
+const char kPreviousApp[] = "previous-app";
+
 }  // namespace switches