diff --git a/core/java/android/app/ActivityOptions.java b/core/java/android/app/ActivityOptions.java
index 933f98d..821621e 100644
--- a/core/java/android/app/ActivityOptions.java
+++ b/core/java/android/app/ActivityOptions.java
@@ -16,6 +16,8 @@
 
 package android.app;
 
+import static android.app.ActivityManager.DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT;
+
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
@@ -127,6 +129,12 @@
     public static final String KEY_ANIM_START_LISTENER = "android:activity.animStartListener";
 
     /**
+     * Where the docked stack should be positioned.
+     * @hide
+     */
+    private static final String KEY_DOCK_CREATE_MODE = "android:activity.dockCreateMode";
+
+    /**
      * For Activity transitions, the calling Activity's TransitionListener used to
      * notify the called Activity when the shared element and the exit transitions
      * complete.
@@ -190,6 +198,7 @@
     private int mResultCode;
     private int mExitCoordinatorIndex;
     private PendingIntent mUsageTimeReport;
+    private int mDockCreateMode = DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT;
 
     /**
      * Create an ActivityOptions specifying a custom animation to run when
@@ -688,6 +697,7 @@
                 mExitCoordinatorIndex = opts.getInt(KEY_EXIT_COORDINATOR_INDEX);
                 break;
         }
+        mDockCreateMode = opts.getInt(KEY_DOCK_CREATE_MODE, DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT);
     }
 
     /** @hide */
@@ -806,6 +816,14 @@
         }
     }
 
+    /** @hide */
+    public int getDockCreateMode() { return mDockCreateMode; }
+
+    /** @hide */
+    public void setDockCreateMode(int dockCreateMode) {
+        mDockCreateMode = dockCreateMode;
+    }
+
     /**
      * Update the current values in this ActivityOptions from those supplied
      * in <var>otherOptions</var>.  Any values
@@ -945,6 +963,7 @@
                 b.putInt(KEY_EXIT_COORDINATOR_INDEX, mExitCoordinatorIndex);
                 break;
         }
+        b.putInt(KEY_DOCK_CREATE_MODE, mDockCreateMode);
 
         return b;
     }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
index 3a30a8f..b07d23c 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
@@ -409,7 +409,7 @@
         SystemServicesProxy ssp = Recents.getSystemServices();
         ActivityManager.RunningTaskInfo topTask = ssp.getTopMostTask();
         if (topTask != null && !ssp.isInHomeStack(topTask.id)) {
-            ssp.moveTaskToDockedStack(topTask.id,
+            ssp.startTaskInDockedMode(topTask.id,
                     ActivityManager.DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT);
             showRecents(false /* triggeredFromAltTab */);
         }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
index 221af15..0b01538 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
@@ -284,18 +284,9 @@
         if (mIam == null) return;
 
         try {
-            mIam.startActivityFromRecents(taskId, DOCKED_STACK_ID, null);
-        } catch (RemoteException e) {
-            e.printStackTrace();
-        }
-    }
-
-    /** Docks an already resumed task to the side of the screen. */
-    public void moveTaskToDockedStack(int taskId, int createMode) {
-        if (mIam == null) return;
-
-        try {
-            mIam.moveTaskToDockedStack(taskId, createMode, true /* onTop */);
+            final ActivityOptions options = ActivityOptions.makeBasic();
+            options.setDockCreateMode(createMode);
+            mIam.startActivityFromRecents(taskId, DOCKED_STACK_ID, options.toBundle());
         } catch (RemoteException e) {
             e.printStackTrace();
         }
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 257f034..dbbce49 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -3844,8 +3844,8 @@
             Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
             int startFlags, ProfilerInfo profilerInfo, Bundle options) {
         return startActivityAsUser(caller, callingPackage, intent, resolvedType, resultTo,
-            resultWho, requestCode, startFlags, profilerInfo, options,
-            UserHandle.getCallingUserId());
+                resultWho, requestCode, startFlags, profilerInfo, options,
+                UserHandle.getCallingUserId());
     }
 
     @Override
@@ -4152,7 +4152,12 @@
             Slog.w(TAG, msg);
             throw new SecurityException(msg);
         }
-        return startActivityFromRecentsInner(taskId, launchStackId, options);
+        final long origId = Binder.clearCallingIdentity();
+        try {
+            return startActivityFromRecentsInner(taskId, launchStackId, options);
+        } finally {
+            Binder.restoreCallingIdentity(origId);
+        }
     }
 
     final int startActivityFromRecentsInner(int taskId, int launchStackId, Bundle options) {
@@ -4174,8 +4179,12 @@
             }
 
             if (launchStackId != INVALID_STACK_ID && task.stack.mStackId != launchStackId) {
-                mStackSupervisor.moveTaskToStackUncheckedLocked(
-                        task, launchStackId, ON_TOP, FORCE_FOCUS, "startActivityFromRecents");
+                if (launchStackId == DOCKED_STACK_ID && options != null) {
+                    ActivityOptions activityOptions = new ActivityOptions(options);
+                    mWindowManager.setDockedStackCreateMode(activityOptions.getDockCreateMode());
+                }
+                mStackSupervisor.moveTaskToStackLocked(
+                        taskId, launchStackId, ON_TOP, FORCE_FOCUS, "startActivityFromRecents");
             }
 
             if (task.getRootActivity() != null) {
@@ -9029,7 +9038,8 @@
                 }
                 if (DEBUG_STACK) Slog.d(TAG_STACK, "moveActivityToStack: moving r=" + r
                         + " to stackId=" + stackId);
-                mStackSupervisor.moveTaskToStackLocked(r.task.taskId, stackId, ON_TOP, !FORCE_FOCUS);
+                mStackSupervisor.moveTaskToStackLocked(r.task.taskId, stackId, ON_TOP, !FORCE_FOCUS,
+                        "moveActivityToStack");
             } finally {
                 Binder.restoreCallingIdentity(ident);
             }
@@ -9049,7 +9059,8 @@
             try {
                 if (DEBUG_STACK) Slog.d(TAG_STACK, "moveTaskToStack: moving task=" + taskId
                         + " to stackId=" + stackId + " toTop=" + toTop);
-                mStackSupervisor.moveTaskToStackLocked(taskId, stackId, toTop, !FORCE_FOCUS);
+                mStackSupervisor.moveTaskToStackLocked(taskId, stackId, toTop, !FORCE_FOCUS,
+                        "moveTaskToStack");
             } finally {
                 Binder.restoreCallingIdentity(ident);
             }
@@ -9078,7 +9089,7 @@
                         + " to createMode=" + createMode + " toTop=" + toTop);
                 mWindowManager.setDockedStackCreateMode(createMode);
                 mStackSupervisor.moveTaskToStackLocked(
-                        taskId, DOCKED_STACK_ID, toTop, !FORCE_FOCUS);
+                        taskId, DOCKED_STACK_ID, toTop, !FORCE_FOCUS, "moveTaskToDockedStack");
             } finally {
                 Binder.restoreCallingIdentity(ident);
             }
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index cd2f124..3bf87d8 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -3032,7 +3032,7 @@
                     final int count = tasks.size();
                     for (int i = 0; i < count; i++) {
                         moveTaskToStackLocked(tasks.get(i).taskId,
-                                FULLSCREEN_WORKSPACE_STACK_ID, ON_TOP, FORCE_FOCUS);
+                                FULLSCREEN_WORKSPACE_STACK_ID, ON_TOP, FORCE_FOCUS, "resizeStack");
                     }
 
                     // stack shouldn't contain anymore activities, so nothing to resume.
@@ -3267,13 +3267,13 @@
         return stack;
     }
 
-    void moveTaskToStackLocked(int taskId, int stackId, boolean toTop, boolean forceFocus) {
+    void moveTaskToStackLocked(int taskId, int stackId, boolean toTop, boolean forceFocus,
+            String reason) {
         final TaskRecord task = anyTaskForIdLocked(taskId);
         if (task == null) {
             Slog.w(TAG, "moveTaskToStack: no task for id=" + taskId);
             return;
         }
-        final String reason = "moveTaskToStack";
         if (stackId == DOCKED_STACK_ID || stackId == PINNED_STACK_ID
                 || stackId == FULLSCREEN_WORKSPACE_STACK_ID) {
             // We are about to relaunch the activity because its configuration changed due to
@@ -3286,7 +3286,8 @@
             mWindowManager.setReplacingWindow(r.appToken, true /* animate */);
         }
         final ActivityStack stack =
-                moveTaskToStackUncheckedLocked(task, stackId, toTop, forceFocus, reason);
+                moveTaskToStackUncheckedLocked(task, stackId, toTop, forceFocus,
+                        "moveTaskToStack:" + reason);
 
         // Make sure the task has the appropriate bounds/size for the stack it is in.
         if (stackId == FULLSCREEN_WORKSPACE_STACK_ID && task.mBounds != null) {
@@ -3332,7 +3333,8 @@
         if (task.mActivities.size() == 1) {
             // There is only one activity in the task. So, we can just move the task over to the
             // pinned stack without re-parenting the activity in a different task.
-            moveTaskToStackLocked(task.taskId, PINNED_STACK_ID, ON_TOP, FORCE_FOCUS);
+            moveTaskToStackLocked(task.taskId, PINNED_STACK_ID, ON_TOP, FORCE_FOCUS,
+                    "moveTopActivityToPinnedStack");
         } else {
             final ActivityStack pinnedStack = getStack(PINNED_STACK_ID, CREATE_IF_NEEDED, ON_TOP);
             pinnedStack.moveActivityToStack(r);