Use pidof to get pid of :BaselineIME process.

BaseineIme.getPid() always returns 0 in the main process.

Bug: 192696127
Test: atest ImePerfTest#testShowImeCold
Change-Id: I054f09972d54b0d50c62025578e4f6f6e2e93c50

apct-tests/perftests/inputmethod/src/android/inputmethod/ImePerfTest.java

@@ -24,8 +24,6 @@ import static android.view.WindowInsetsAnimation.Callback.DISPATCH_MODE_STOP;
 
 import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;
 
-import static org.junit.Assert.assertTrue;
-
 import android.annotation.UiThread;
 import android.app.Activity;
 import android.content.ComponentName;
@@ -39,6 +37,7 @@ import android.perftests.utils.PerfManualStatusReporter;
 import android.perftests.utils.TraceMarkParser;
 import android.perftests.utils.TraceMarkParser.TraceMarkSlice;
 import android.provider.Settings;
+import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
@@ -53,6 +52,7 @@ import androidx.annotation.Nullable;
 import androidx.test.filters.LargeTest;
 
 import com.android.compatibility.common.util.PollingCheck;
+import com.android.compatibility.common.util.SystemUtil;
 
 import junit.framework.Assert;
 
@@ -185,7 +185,6 @@ public class ImePerfTest extends ImePerfTestBase
     public static class BaselineIme extends InputMethodService {
 
         public static final int HEIGHT_DP = 100;
-        private static int sPid;
 
         @Override
         public View onCreateInputView() {
@@ -196,14 +195,10 @@ public class ImePerfTest extends ImePerfTestBase
             view.setPadding(0, 0, 0, 0);
             view.addView(inner, new FrameLayout.LayoutParams(MATCH_PARENT, height));
             inner.setBackgroundColor(0xff01fe10); // green
-            sPid = Process.myPid();
+            Log.v(TAG, "onCreateInputView");
             return view;
         }
 
-        static int getPid() {
-            return sPid;
-        }
-
         static ComponentName getName(Context context) {
             return new ComponentName(context, BaselineIme.class);
         }
@@ -281,9 +276,16 @@ public class ImePerfTest extends ImePerfTestBase
     }
 
     private void killBaselineIme() {
-        assertTrue("PID of test and IME can't be same",
-                Process.myPid() != BaselineIme.getPid());
-        Process.killProcess(BaselineIme.getPid());
+        // pidof returns a space separated list of numeric PIDs.
+        String result = SystemUtil.runShellCommand(
+                "pidof com.android.perftests.inputmethod:BaselineIME");
+        for (String pid : result.trim().split(" ")) {
+            // The output may be empty if there is no process with the name.
+            if (TextUtils.isEmpty(pid)) {
+                continue;
+            }
+            Process.killProcess(Integer.parseInt(pid));
+        }
     }
 
     private void testShowOrHideImeWarm(final boolean show) throws Throwable {