Modify pin widget dialog open-close animation.

Pin widget sheet should open from bottom up and close on drag down.
Behaviour with navigation bar is similar to that of widgets bottom sheet.

Add a drag layer and reuse AbstractSlideInView for open-close
animation.

Test: Tested manually- opening, closing through dragging/ cancel button/
back button. Adding widget to screen by dragging/ add to home screen
button.
Bug: 186124244

Change-Id: I4b77d5bdd4ed1689b651847dfed69d19cafa7456
diff --git a/AndroidManifest-common.xml b/AndroidManifest-common.xml
index 87a08af..d725a16 100644
--- a/AndroidManifest-common.xml
+++ b/AndroidManifest-common.xml
@@ -107,7 +107,7 @@
                        android:value="true" />
 
         <activity android:name="com.android.launcher3.dragndrop.AddItemActivity"
-            android:theme="@style/AppItemActivityTheme"
+            android:theme="@style/AddItemActivityTheme"
             android:excludeFromRecents="true"
             android:autoRemoveFromRecents="true"
             android:exported="true">