Request split launches using a new enum, snapPosition, rather than a float splitRatio

Split ratios are now stored as an int enum rather than float values. Previously, split ratios were stored as floats, which needed to be recalculated frequently and differed depending on device screen size. Now Shell to store and launch split screen setups using an enum rather than floats.

Bug: 274835596
Bug: 182839788
Test: Existing tests still pass
Change-Id: Iebb8d3c7e8f9d597a59b677e48072300ddea458f

quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java

@@ -50,9 +50,9 @@ import static com.android.launcher3.testing.shared.TestProtocol.QUICK_SWITCH_STA
 import static com.android.launcher3.util.DisplayController.CHANGE_ACTIVE_SCREEN;
 import static com.android.launcher3.util.DisplayController.CHANGE_NAVIGATION_MODE;
 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
-import static com.android.launcher3.util.SplitConfigurationOptions.DEFAULT_SPLIT_RATIO;
 import static com.android.quickstep.util.SplitAnimationTimings.TABLET_HOME_TO_SPLIT;
 import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_HOME_KEY;
+import static com.android.wm.shell.common.split.SplitScreenConstants.SNAP_TO_50_50;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
@@ -1260,10 +1260,8 @@ public class QuickstepLauncher extends Launcher {
                 /* callback= */ success -> mSplitSelectStateController.resetState(),
                 /* freezeTaskList= */ true,
                 groupTask.mSplitBounds == null
-                        ? DEFAULT_SPLIT_RATIO
-                        : groupTask.mSplitBounds.appsStackedVertically
-                                ? groupTask.mSplitBounds.topTaskPercent
-                                : groupTask.mSplitBounds.leftTaskPercent);
+                        ? SNAP_TO_50_50
+                        : groupTask.mSplitBounds.snapPosition);
     }
 
     /**