Create default InCallService with Context.BIND_IMPORTANT

Docs suggest that this is good to do when starting a service from an 
activity. 

Performance is too affected by b/18338152 to get accurate measurements
right now, but this change doesn't seem to hurt (~50ms faster across 
9 runs, 3 runs per reboot).

Bug: 18373617

Change-Id: I235120f23ab972157653c9863f99511adbac747b
diff --git a/src/com/android/server/telecom/InCallController.java b/src/com/android/server/telecom/InCallController.java
index 46fdcdb..60c51e4 100644
--- a/src/com/android/server/telecom/InCallController.java
+++ b/src/com/android/server/telecom/InCallController.java
@@ -314,8 +314,11 @@
                         Intent intent = new Intent(InCallService.SERVICE_INTERFACE);
                         intent.setComponent(componentName);
 
-                        if (mContext.bindServiceAsUser(intent, inCallServiceConnection,
-                                Context.BIND_AUTO_CREATE, UserHandle.CURRENT)) {
+                        final int bindFlags = mInCallComponentName.equals(componentName)
+                                ? Context.BIND_AUTO_CREATE | Context.BIND_IMPORTANT
+                                : Context.BIND_AUTO_CREATE;
+                        if (mContext.bindServiceAsUser(intent, inCallServiceConnection, bindFlags,
+                                UserHandle.CURRENT)) {
                             mServiceConnections.put(componentName, inCallServiceConnection);
                         }
                     }