[Overview Actions] Update the actions container UI.

Make the overview actions container not limited by the taskview any more, and add left and right margin as 16dp to it.

Screenshot: https://hsv.googleplex.com/5938979251683328
Test: local
Bug: 153591867
Change-Id: I8056105fe4c03311e473bb317cba345048ec2203

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

@@ -2139,13 +2139,15 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
                 && SysUINavigationMode.removeShelfFromOverview(mActivity)) {
             mActionsView = ((ViewGroup) getParent()).findViewById(R.id.overview_actions_view);
             if (mActionsView != null) {
-                Rect rect = new Rect();
-                getTaskSize(rect);
                 InsettableFrameLayout.LayoutParams layoutParams =
-                        new InsettableFrameLayout.LayoutParams(rect.width(),
+                        new InsettableFrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,
                                 getResources().getDimensionPixelSize(
                                         R.dimen.overview_actions_height));
                 layoutParams.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;
+                int margin = getResources().getDimensionPixelSize(
+                        R.dimen.overview_actions_horizontal_margin);
+                layoutParams.setMarginStart(margin);
+                layoutParams.setMarginEnd(margin);
                 mActionsView.setLayoutParams(layoutParams);
                 showActionsView();
             }

quickstep/res/values/dimens.xml

@@ -25,6 +25,7 @@
 
     <!-- Overrideable in overlay that provides the Overview Actions. -->
     <dimen name="overview_actions_height">110dp</dimen>
+    <dimen name="overview_actions_horizontal_margin">16dp</dimen>
 
     <dimen name="recents_page_spacing">10dp</dimen>
     <dimen name="recents_clear_all_deadzone_vertical_margin">70dp</dimen>