Update dream settings UX to match latest mocks.

Updates:
- removed individual complication toggle
- added single toggle which enables/disables all supported complications
- updated colors to match mocks
- updated grid padding in order to line up with existing content. Note:
  this required more complex padding logic, using an item decorator to
  apply the padding only to inner grid elements.
- updated preview image, removing view nesting to make better use of
  ConstraintLayout
- Updated some strings to match mocks

Test: locally on device
Bug: 217555053
Change-Id: I573e5f4ed807cbe2ae9e00f183d402e6e3339590

src/com/android/settings/dream/DreamComplicationPreferenceController.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.dream;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settingslib.dream.DreamBackend;
+
+/**
+ * Controller for the {@link androidx.preference.SwitchPreference} which controls if dream
+ * overlays should be enabled.
+ */
+public class DreamComplicationPreferenceController extends TogglePreferenceController {
+    private final DreamBackend mBackend;
+
+    public DreamComplicationPreferenceController(Context context, String key) {
+        super(context, key);
+        mBackend = DreamBackend.getInstance(context);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mBackend.getSupportedComplications().isEmpty() ? CONDITIONALLY_UNAVAILABLE
+                : AVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mBackend.getEnabledComplications().containsAll(mBackend.getSupportedComplications());
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        for (int complication : mBackend.getSupportedComplications()) {
+            mBackend.setComplicationEnabled(complication, isChecked);
+        }
+        return true;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
+}