[Pip2] Use PipFlags#isPip2ExperimentEnabled in Launcher

instead of checking Flags#enablePip2 directly

Bug: 409622499
Test: m
Flag: com.android.wm.shell.enable_pip2
Change-Id: I4892d6590403202737e40d21c6d215c1adc7b47e

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -167,10 +167,10 @@ import com.android.systemui.shared.system.InteractionJankMonitorWrapper;
 import com.android.systemui.shared.system.SysUiStatsLog;
 import com.android.systemui.shared.system.TaskStackChangeListener;
 import com.android.systemui.shared.system.TaskStackChangeListeners;
-import com.android.wm.shell.Flags;
 import com.android.wm.shell.shared.GroupedTaskInfo;
 import com.android.wm.shell.shared.TransactionPool;
 import com.android.wm.shell.shared.desktopmode.DesktopModeStatus;
+import com.android.wm.shell.shared.pip.PipFlags;
 import com.android.wm.shell.shared.startingsurface.SplashScreenExitAnimationUtils;
 
 import com.google.android.msdl.data.model.MSDLToken;
@@ -2320,7 +2320,7 @@ public abstract class AbsSwipeUpHandler<
                     mSwipePipToHomeAnimator.getFinishTransaction(),
                     mSwipePipToHomeAnimator.getContentOverlay());
             mIsSwipingPipToHome = false;
-        } else if (mIsSwipeForSplit && !Flags.enablePip2()) {
+        } else if (mIsSwipeForSplit && !PipFlags.isPip2ExperimentEnabled()) {
             // Transaction to hide the task to avoid flicker for entering PiP from split-screen.
             // Note: PiP2 handles entering differently, so skip if enable_pip2=true
             PictureInPictureSurfaceTransaction tx =

quickstep/src/com/android/quickstep/views/RecentsView.java

@@ -245,6 +245,7 @@ import com.android.wm.shell.common.pip.IPipAnimationListener;
 import com.android.wm.shell.shared.GroupedTaskInfo;
 import com.android.wm.shell.shared.desktopmode.DesktopModeStatus;
 import com.android.wm.shell.shared.desktopmode.DesktopModeTransitionSource;
+import com.android.wm.shell.shared.pip.PipFlags;
 import com.android.wm.shell.shared.split.SplitBounds;
 
 import kotlin.Unit;
@@ -6037,7 +6038,7 @@ public abstract class RecentsView<
         }
 
         final boolean sendUserLeaveHint = toRecents && shouldPip;
-        if (sendUserLeaveHint && !com.android.wm.shell.Flags.enablePip2()) {
+        if (sendUserLeaveHint && !PipFlags.isPip2ExperimentEnabled()) {
             // Notify the SysUI to use fade-in animation when entering PiP from live tile.
             // Note: PiP2 handles entering differently, so skip if enable_pip2=true.
             final SystemUiProxy systemUiProxy = SystemUiProxy.INSTANCE.get(getContext());