Add infra for battery tip

This cl adds the basic structure for battery tip:
1. BaseBatteryTip: Model class to represent the tip and build
preference and dialog
2. SummaryTip: Display a general battery summary(i.e. your battery
is good..)
3. BatteryTipLoader: AsyncLoader to load the battery tips.
4. BatteryTipPreferenceController: preference controller for
preference group to display battery tips

This cl also:
1. Remove the anomaly code in PowerUsageSummary and we will add it
to app restriction in future.
2. Add preference_category_no_title.xml to avoid the extra 32dp
blank at the top.

Bug: 70570352
Test: RunSettingsRoboTests
Change-Id: If91a553888e2eb91d55fb1d0d7bbea69652f144c

src/com/android/settings/fuelgauge/batterytip/tips/SummaryTip.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017 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.fuelgauge.batterytip.tips;
+
+import android.app.Dialog;
+import android.content.Context;
+
+import com.android.settings.R;
+
+/**
+ * Tip to show general summary about battery life
+ */
+public class SummaryTip extends BatteryTip {
+
+    public SummaryTip(@StateType int state) {
+        mShowDialog = false;
+        mState = state;
+    }
+
+    @Override
+    public CharSequence getTitle(Context context) {
+        return context.getString(R.string.battery_tip_summary_title);
+    }
+
+    @Override
+    public CharSequence getSummary(Context context) {
+        return context.getString(R.string.battery_tip_summary_summary);
+    }
+
+    @Override
+    public int getIconId() {
+        return R.drawable.ic_check_circle_green_24dp;
+    }
+
+    @Override
+    public void updateState(BatteryTip tip) {
+        mState = tip.mState;
+    }
+
+    @Override
+    public void action() {
+        // do nothing
+    }
+
+    @Override
+    public Dialog buildDialog() {
+        //TODO(b/70570352): create the dialog for summary tip and add test
+        return null;
+    }
+}