Removing BaseDraggingActivity

> Merging come methods to BaseActivtiy
> Separating wallpaper theme implementation to an independent class

Bug: 393703968
Flag: EXEMPT refactor
Test: Presubmit
Change-Id: I8cdb6d1520beff3f8226b62c5b7eafd48b2c674f

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

@@ -459,7 +459,7 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
 
     protected void onItemClicked(View view) {
         if (!mSplitToWorkspaceController.handleSecondAppSelectionForSplit(view)) {
-            QuickstepLauncher.super.getItemOnClickListener().onClick(view);
+            super.getItemOnClickListener().onClick(view);
         }
     }
 
@@ -731,6 +731,9 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
         final boolean ret = super.initDeviceProfile(idp);
         mDeviceProfile.isPredictiveBackSwipe =
                 getApplicationInfo().isOnBackInvokedCallbackEnabled();
+        if (ret) {
+            SystemUiProxy.INSTANCE.get(this).setLauncherAppIconSize(mDeviceProfile.iconSizePx);
+        }
         return ret;
     }
 
@@ -1237,6 +1240,7 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
         }
     }
 
+    @NonNull
     @Override
     public ActivityOptionsWrapper getActivityLaunchOptions(View v, @Nullable ItemInfo item) {
         ActivityOptionsWrapper activityOptions = mAppTransitionManager.getActivityLaunchOptions(
@@ -1366,12 +1370,6 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
                 .areDesktopTasksVisibleAndNotInOverview();
     }
 
-    @Override
-    protected void onDeviceProfileInitiated() {
-        super.onDeviceProfileInitiated();
-        SystemUiProxy.INSTANCE.get(this).setLauncherAppIconSize(mDeviceProfile.iconSizePx);
-    }
-
     @Override
     public void dispatchDeviceProfileChanged() {
         super.dispatchDeviceProfileChanged();
@@ -1508,4 +1506,9 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
     public void setCanShowAllAppsEducationView(boolean canShowAllAppsEducationView) {
         mCanShowAllAppsEducationView = canShowAllAppsEducationView;
     }
+
+    @Override
+    public void returnToHomescreen() {
+        getStateManager().goToState(LauncherState.NORMAL);
+    }
 }