DO NOT MERGE Refactor StatusBar and CarStatusBar to optimize automotive boot time.

Test: Robolectric -- Robolectric results are identical before and after this change.

Test: Manual -- Hawk is booting successfully and interacting with different
 parts of CarStatusBar is not failing.

Test: Manual -- Pixel 2 is booting successfully and interacting with different
 parts of StatusBar is not failing.

Bug: 142342652
Bug: 140999054
Change-Id: Idf5e152aa661f06b7a041d39d759595636807dce

packages/SystemUI/src/com/android/systemui/SystemUIApplication.java

@@ -176,9 +176,11 @@ public class SystemUIApplication extends Application implements SysUiServiceProv
 
         Log.v(TAG, "Starting SystemUI services for user " +
                 Process.myUserHandle().getIdentifier() + ".");
+
         TimingsTraceLog log = new TimingsTraceLog("SystemUIBootTiming",
                 Trace.TRACE_TAG_APP);
         log.traceBegin(metricsPrefix);
+
         final int N = services.length;
         for (int i = 0; i < N; i++) {
             String clsName = services[i];