Default emergency gesture setting On.

And a few drive-by fixes:
* Move all emergency gesture fragments and controllers to emergency
  package for better code colocation.
* Remove the placeholder video preference from emergency_gesture_settings.xml

Bug: 178009196
Test: reran robotests
Change-Id: Ifcb591e7ab8e5e5494c480cbbe9410c08c296f8e

src/com/android/settings/emergency/EmergencyGestureEntrypointPreferenceController.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import android.content.Context;
 import android.content.Intent;

src/com/android/settings/emergency/EmergencyGestureNumberOverridePreference.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import static android.content.DialogInterface.BUTTON_POSITIVE;
 

src/com/android/settings/emergency/EmergencyGestureNumberOverridePreferenceController.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import static com.android.settingslib.emergencynumber.EmergencyNumberUtils.EMERGENCY_NUMBER_OVERRIDE_AUTHORITY;
 

src/com/android/settings/emergency/EmergencyGesturePreferenceController.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import android.content.Context;
 import android.provider.Settings;
@@ -71,7 +71,7 @@ public class EmergencyGesturePreferenceController extends BasePreferenceControll
 
     @VisibleForTesting
     public boolean isChecked() {
-        return Settings.Secure.getInt(mContext.getContentResolver(), SECURE_KEY, OFF) == ON;
+        return Settings.Secure.getInt(mContext.getContentResolver(), SECURE_KEY, ON) == ON;
     }
 
     @Override

src/com/android/settings/emergency/EmergencyGestureSettings.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;

src/com/android/settings/emergency/EmergencyGestureSoundPreferenceController.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.settings.gestures;
+package com.android.settings.emergency;
 
 import android.content.Context;
 import android.provider.Settings;
@@ -22,11 +22,12 @@ import android.provider.Settings;
 import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
 
 /**
  * Preference controller for emergency sos gesture setting
  */
-public class EmergencyGestureSoundPreferenceController extends GesturePreferenceController {
+public class EmergencyGestureSoundPreferenceController extends TogglePreferenceController {
 
     @VisibleForTesting
     static final int ON = 1;
@@ -39,11 +40,6 @@ public class EmergencyGestureSoundPreferenceController extends GesturePreference
         super(context, key);
     }
 
-    @Override
-    protected String getVideoPrefKey() {
-        return "emergency_gesture_screen_video";
-    }
-
     private static boolean isGestureAvailable(Context context) {
         return context.getResources()
                 .getBoolean(R.bool.config_show_emergency_gesture_settings);