Add Settings.WallpaperSettingsActivity

Provide a way to open wallpaper settings directly.

Bug: 26688904
Change-Id: I3e862b45ad8a4cec59f89495c993f0852c720e55

AndroidManifest.xml

@@ -829,6 +829,18 @@
                 android:resource="@string/zen_mode_automation_suggestion_summary" />
         </activity>
 
+        <activity android:name="Settings$WallpaperSettingsActivity"
+                  android:label="@string/wallpaper_settings_fragment_title"
+                  android:icon="@drawable/ic_wallpaper"
+                  android:taskAffinity="">
+            <intent-filter android:priority="1">
+                <action android:name="android.settings.WALLPAPER_SETTINGS" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                       android:value="com.android.settings.WallpaperTypeSettings" />
+        </activity>
+
         <activity android:name="Settings$WallpaperSuggestionActivity"
                 android:label="@string/wallpaper_settings_title"
                 android:exported="true"

src/com/android/settings/Settings.java

@@ -134,6 +134,7 @@ public class Settings extends SettingsActivity {
         /* empty */
     }
     public static class ScreenLockSuggestionActivity extends ChooseLockGeneric { /* empty */ }
+    public static class WallpaperSettingsActivity extends SettingsActivity { /* empty */ }
 
     // Categories.
     public static class WirelessSettings extends SettingsActivity { /* empty */ }