More logging for the widgets scroll bug

Bug: 160238801
Change-Id: I198aea39ccbb3b4ab6d8696cccc868cf6465b9d2

src/com/android/launcher3/widget/WidgetsDiffReporter.java

@@ -20,8 +20,10 @@ import android.util.Log;
 
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.android.launcher3.Utilities;
 import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.model.data.PackageItemInfo;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.widget.WidgetsListAdapter.WidgetListRowEntryComparator;
 
 import java.util.ArrayList;
@@ -32,8 +34,8 @@ import java.util.Iterator;
  * methods accordingly.
  */
 public class WidgetsDiffReporter {
-    private static final boolean DEBUG = false;
-    private static final String TAG = "WidgetsDiffReporter";
+    private static final boolean DEBUG = Utilities.IS_RUNNING_IN_TEST_HARNESS; // b/160238801
+    private static final String TAG = TestProtocol.NO_SCROLL_END_WIDGETS;
 
     private final IconCache mIconCache;
     private final RecyclerView.Adapter mListener;

src/com/android/launcher3/widget/WidgetsRecyclerView.java

@@ -120,6 +120,9 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
     public int getCurrentScrollY() {
         // Skip early if widgets are not bound.
         if (isModelNotReady() || getChildCount() == 0) {
+            if (Utilities.IS_RUNNING_IN_TEST_HARNESS) {
+                Log.d(TestProtocol.NO_SCROLL_END_WIDGETS, "getCurrentScrollY: -1");
+            }
             return -1;
         }
 
@@ -128,6 +131,10 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
         int y = (child.getMeasuredHeight() * rowIndex);
         int offset = getLayoutManager().getDecoratedTop(child);
 
+        if (Utilities.IS_RUNNING_IN_TEST_HARNESS) {
+            Log.d(TestProtocol.NO_SCROLL_END_WIDGETS,
+                    "getCurrentScrollY: " + (getPaddingTop() + y - offset));
+        }
         return getPaddingTop() + y - offset;
     }