Allow ToolbarActionBar to pass-through unhandled keyShortcuts

It was consuming all keyShortcuts which broke system hotkeys
like shift+tab.

In order to prevent the decor/phonewindow from creating menus,
this creates a dummy view in onCreatePanelView.

This also includes a change to Activity to not send KEYCODE_TAB
keystrokes to the defaulthandler. This was preventing keyboard
navigation from working on any activity that had a default
search fallback.

Bug: 32482282
Bug: 18021345
Test: Added a CTS test (ToolbarTest#testKeyShortcuts) for toolbar
      keyShortcuts. Verified Tab-navigation works in Play Store.
Change-Id: I5c732a2b21219157818bed49576debd20d5a8178
(cherry picked from commit b22faf524e)

core/java/android/app/Activity.java

@@ -2740,6 +2740,10 @@ public class Activity extends ContextThemeWrapper
                 return true;
             }
             return false;
+        } else if (keyCode == KeyEvent.KEYCODE_TAB) {
+            // Don't consume TAB here since it's used for navigation. Arrow keys
+            // aren't considered "typing keys" so they already won't get consumed.
+            return false;
         } else {
             // Common code for DEFAULT_KEYS_DIALER & DEFAULT_KEYS_SEARCH_*
             boolean clearSpannable = false;

core/java/com/android/internal/app/ToolbarActionBar.java

@@ -477,12 +477,9 @@ public class ToolbarActionBar extends ActionBar {
             final KeyCharacterMap kmap = KeyCharacterMap.load(
                     event != null ? event.getDeviceId() : KeyCharacterMap.VIRTUAL_KEYBOARD);
             menu.setQwertyMode(kmap.getKeyboardType() != KeyCharacterMap.NUMERIC);
-            menu.performShortcut(keyCode, event, 0);
+            return menu.performShortcut(keyCode, event, 0);
         }
-        // This action bar always returns true for handling keyboard shortcuts.
-        // This will block the window from preparing a temporary panel to handle
-        // keyboard shortcuts.
-        return true;
+        return false;
     }
 
     @Override
@@ -525,6 +522,17 @@ public class ToolbarActionBar extends ActionBar {
             }
             return result;
         }
+
+        @Override
+        public View onCreatePanelView(int featureId) {
+            if (featureId == Window.FEATURE_OPTIONS_PANEL) {
+                // This gets called by PhoneWindow.preparePanel. Since this already manages
+                // its own panel, we return a dummy view here to prevent PhoneWindow from
+                // preparing a default one.
+                return new View(mDecorToolbar.getContext());
+            }
+            return super.onCreatePanelView(featureId);
+        }
     }
 
     private final class ActionMenuPresenterCallback implements MenuPresenter.Callback {