Close floating panels on Launcher when using Escape

This change will make the Escape key close floating panels in
Launcher.

Bug: 280801803
Test: Flashed on device, tried with physical keyboard and panels
will close.

Change-Id: Ie09e57716a7be74638037abe6272b47eec1b8a6c

src/com/android/launcher3/Launcher.java

@@ -3159,6 +3159,16 @@ public class Launcher extends StatefulActivity<LauncherState>
         return super.onKeyShortcut(keyCode, event);
     }
 
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_ESCAPE) {
+            // Close any open floating views.
+            closeOpenViews();
+            return true;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
     @Override
     public boolean onKeyUp(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_MENU) {