diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 269a591..02b2d8d 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -85,6 +85,7 @@
 import com.android.launcher3.pageindicators.WorkspacePageIndicator;
 import com.android.launcher3.popup.PopupContainerWithArrow;
 import com.android.launcher3.shortcuts.ShortcutDragPreviewProvider;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.touch.WorkspaceTouchListener;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
@@ -420,6 +421,9 @@
         }
 
         // Always enter the spring loaded mode
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DRAG_TO_WORKSPACE, "Switching to SPRING_LOADED");
+        }
         mLauncher.getStateManager().goToState(SPRING_LOADED);
     }
 
@@ -1741,6 +1745,9 @@
     public void prepareAccessibilityDrop() { }
 
     public void onDrop(final DragObject d, DragOptions options) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DRAG_TO_WORKSPACE, "Workspace.onDrop");
+        }
         mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
         CellLayout dropTargetLayout = mDropToLayout;
 
@@ -2418,6 +2425,9 @@
      * to add an item to one of the workspace screens.
      */
     private void onDropExternal(final int[] touchXY, final CellLayout cellLayout, DragObject d) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DRAG_TO_WORKSPACE, "Workspace.onDropExternal");
+        }
         if (d.dragInfo instanceof PendingAddShortcutInfo) {
             WorkspaceItemInfo si = ((PendingAddShortcutInfo) d.dragInfo)
                     .activityInfo.createWorkspaceItemInfo();
diff --git a/src/com/android/launcher3/dragndrop/DragController.java b/src/com/android/launcher3/dragndrop/DragController.java
index d32dd2e..b72fd98 100644
--- a/src/com/android/launcher3/dragndrop/DragController.java
+++ b/src/com/android/launcher3/dragndrop/DragController.java
@@ -579,6 +579,9 @@
     }
 
     private void drop(DropTarget dropTarget, Runnable flingAnimation) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DRAG_TO_WORKSPACE, "DragController.drop");
+        }
         final int[] coordinates = mCoordinatesTemp;
         mDragObject.x = coordinates[0];
         mDragObject.y = coordinates[1];
diff --git a/src/com/android/launcher3/dragndrop/DragDriver.java b/src/com/android/launcher3/dragndrop/DragDriver.java
index 84fc94d..bd2a03b 100644
--- a/src/com/android/launcher3/dragndrop/DragDriver.java
+++ b/src/com/android/launcher3/dragndrop/DragDriver.java
@@ -17,10 +17,12 @@
 package com.android.launcher3.dragndrop;
 
 import android.content.Context;
+import android.util.Log;
 import android.view.DragEvent;
 import android.view.MotionEvent;
 
 import com.android.launcher3.DropTarget.DragObject;
+import com.android.launcher3.testing.TestProtocol;
 
 /**
  * Base class for driving a drag/drop operation.
@@ -52,6 +54,9 @@
                 mEventListener.onDriverDragMove(ev.getX(), ev.getY());
                 break;
             case MotionEvent.ACTION_UP:
+                if (TestProtocol.sDebugTracing) {
+                    Log.d(TestProtocol.NO_DRAG_TO_WORKSPACE, "DragDriver.ACTION_UP");
+                }
                 mEventListener.onDriverDragMove(ev.getX(), ev.getY());
                 mEventListener.onDriverDragEnd(ev.getX(), ev.getY());
                 break;
diff --git a/src/com/android/launcher3/testing/TestProtocol.java b/src/com/android/launcher3/testing/TestProtocol.java
index 9846a04..cb8f811 100644
--- a/src/com/android/launcher3/testing/TestProtocol.java
+++ b/src/com/android/launcher3/testing/TestProtocol.java
@@ -79,4 +79,5 @@
     public static final String REQUEST_DISABLE_DEBUG_TRACING = "disable-debug-tracing";
 
     public static final String NO_BACKGROUND_TO_OVERVIEW_TAG = "b/138251824";
+    public static final String NO_DRAG_TO_WORKSPACE = "b/138729456";
 }
diff --git a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
index c2a3c1c..0c87ab9 100644
--- a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
+++ b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
@@ -173,6 +173,7 @@
 
     @Test
     public void testWorkspace() throws Exception {
+        mLauncher.enableDebugTracing();
         final Workspace workspace = mLauncher.getWorkspace();
 
         // Test that ensureWorkspaceIsScrollable adds a page by dragging an icon there.
@@ -208,6 +209,7 @@
         // Test starting a workspace app.
         final AppIcon app = workspace.getWorkspaceAppIcon("Chrome");
         assertNotNull("No Chrome app in workspace", app);
+        mLauncher.disableDebugTracing();
     }
 
     public static void runIconLaunchFromAllAppsTest(AbstractLauncherUiTest test, AllApps allApps) {
@@ -298,6 +300,7 @@
     @Test
     @PortraitLandscape
     public void testDragAppIcon() throws Throwable {
+        mLauncher.enableDebugTracing();
         // 1. Open all apps and wait for load complete.
         // 2. Drag icon to homescreen.
         // 3. Verify that the icon works on homescreen.
@@ -314,11 +317,13 @@
                 "Launcher activity is the top activity; expecting another activity to be the top "
                         + "one",
                 isInBackground(launcher)));
+        mLauncher.disableDebugTracing();
     }
 
     @Test
     @PortraitLandscape
     public void testDragShortcut() throws Throwable {
+        mLauncher.enableDebugTracing();
         // 1. Open all apps and wait for load complete.
         // 2. Find the app and long press it to show shortcuts.
         // 3. Press icon center until shortcuts appear
@@ -338,6 +343,7 @@
         } finally {
             allApps.unfreeze();
         }
+        mLauncher.disableDebugTracing();
     }
 
     public static String getAppPackageName() {