Support swipe gesture on trackpad to swipe up from app

Bug: 254783214
Test: https://recall.googleplex.com/projects/3388b17c-d22f-46f8-b140-a102690377b4/sessions/92d385dd-bad5-49ea-a0b4-b4bf4010aabb
Change-Id: I74ba4a9e5c5096aaf6475f9cb8f1dc30de48024d

quickstep/src/com/android/quickstep/RotationTouchHelper.java

@@ -16,8 +16,10 @@
 package com.android.quickstep;
 
 import static android.view.Display.DEFAULT_DISPLAY;
+import static android.view.InputDevice.SOURCE_TOUCHSCREEN;
 import static android.view.Surface.ROTATION_0;
 
+import static com.android.launcher3.config.FeatureFlags.ENABLE_TRACKPAD_GESTURE;
 import static com.android.launcher3.util.DisplayController.CHANGE_ACTIVE_SCREEN;
 import static com.android.launcher3.util.DisplayController.CHANGE_ALL;
 import static com.android.launcher3.util.DisplayController.CHANGE_NAVIGATION_MODE;
@@ -232,6 +234,9 @@ public class RotationTouchHelper implements DisplayInfoChangeListener {
      * @return whether the coordinates of the {@param event} is in the swipe up gesture region.
      */
     public boolean isInSwipeUpTouchRegion(MotionEvent event) {
+        if (isTrackpadMotionEvent(event)) {
+            return true;
+        }
         return mOrientationTouchTransformer.touchInValidSwipeRegions(event.getX(), event.getY());
     }
 
@@ -240,10 +245,20 @@ public class RotationTouchHelper implements DisplayInfoChangeListener {
      *         is in the swipe up gesture region.
      */
     public boolean isInSwipeUpTouchRegion(MotionEvent event, int pointerIndex) {
+        if (isTrackpadMotionEvent(event)) {
+            return true;
+        }
         return mOrientationTouchTransformer.touchInValidSwipeRegions(event.getX(pointerIndex),
                 event.getY(pointerIndex));
     }
 
+    private boolean isTrackpadMotionEvent(MotionEvent event) {
+        // TODO: ideally should use event.getClassification(), but currently only the move
+        // events get assigned the correct classification.
+        return ENABLE_TRACKPAD_GESTURE.get()
+                && (event.getSource() & SOURCE_TOUCHSCREEN) != SOURCE_TOUCHSCREEN;
+    }
+
     @Override
     public void onDisplayInfoChanged(Context context, Info info, int flags) {
         onDisplayInfoChangedInternal(info, flags, false);

src/com/android/launcher3/config/FeatureFlags.java

@@ -308,6 +308,9 @@ public final class FeatureFlags {
     public static final BooleanFlag ENABLE_TRANSIENT_TASKBAR = getDebugFlag(
             "ENABLE_TRANSIENT_TASKBAR", false, "Enables transient taskbar.");
 
+    public static final BooleanFlag ENABLE_TRACKPAD_GESTURE = getDebugFlag(
+            "ENABLE_TRACKPAD_GESTURE", false, "Enables trackpad gesture.");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {