Reconcile Zygote process name code with Q release.

Some Zygote code that was pushed to AOSP master is different from the
pushed Q release. In particular, a call to set the process name for a
Zygote child was missing, causing an app zygote test to fail.

Bug: 139535125
Test: atest android.app.cts.ServiceTest#testAppZygoteServices
Change-Id: I53b0bc0116f1573cb1e52a998e10346bd5601f67
Merged-In: I2bce277ff8f2de4614e19d5385fe6712b076f9c9

core/java/com/android/internal/os/ZygoteConnection.java

@@ -479,6 +479,10 @@ class ZygoteConnection {
 
         closeSocket();
 
+        if (parsedArgs.mNiceName != null) {
+            Process.setArgV0(parsedArgs.mNiceName);
+        }
+
         // End of the postFork event.
         Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
         if (parsedArgs.mInvokeWith != null) {