Update data usage UX

Update the UX and dig the data usage screen out of a huge whole of
technical debt.  Switch every to use Preferences rather than standard
layouts and ListViews.

Split data usage into several fragments, all separated.

DataUsageSummary:
 - Shows a summary of the 'default' usage at the top, this will be
   the default sim on phones, or wifi if it has it, or ethernet
   as last attempt to show something.
 - Also has individual categories for each network type that has
   data, cell, wifi, and ethernet. Maybe should look into bt though?

DataUsageList:
- Takes a NetworkTemplate as an input, and can only be reached from
  the network specific categories in DataUsageSummary
- Shows a graph of current usage for that network and links to
  app detail page for any app.
- Has gear link to quick get to billing cycle screen if available

BillingCycleSettings:
 - Just a screen with the cycle day and warning/limits separated
   out from the data usage.

AppDataUsage:
 - App specific data usage details
 - May need some UX iteration given lack of clarity in the spec

Bug: 22459566
Change-Id: I0222d8d7ea7b75a9775207a6026ebbdcce8f5e46

src/com/android/settings/datausage/ChartDataUsagePreference.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 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.datausage;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.net.NetworkPolicy;
+import android.net.NetworkStatsHistory;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.util.AttributeSet;
+import com.android.settings.R;
+import com.android.settings.widget.ChartDataUsageView;
+import com.android.settings.widget.ChartNetworkSeriesView;
+
+public class ChartDataUsagePreference extends Preference {
+
+    private NetworkPolicy mPolicy;
+    private long mStart;
+    private long mEnd;
+    private NetworkStatsHistory mNetwork;
+    private int mSecondaryColor;
+    private int mSeriesColor;
+
+    public ChartDataUsagePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setLayoutResource(R.layout.data_usage_chart);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        ChartDataUsageView chart = (ChartDataUsageView) holder.itemView;
+        chart.setVisibleRange(mStart, mEnd);
+        chart.bindNetworkPolicy(mPolicy);
+        chart.bindNetworkStats(mNetwork);
+        ChartNetworkSeriesView series = (ChartNetworkSeriesView) holder.findViewById(R.id.series);
+        series.setChartColor(Color.BLACK, mSeriesColor, mSecondaryColor);
+    }
+
+    public void bindNetworkPolicy(NetworkPolicy policy) {
+        mPolicy = policy;
+        notifyChanged();
+    }
+
+    public void setVisibleRange(long start, long end) {
+        mStart = start;
+        mEnd = end;
+        notifyChanged();
+    }
+
+    public long getInspectStart() {
+        return mStart;
+    }
+
+    public long getInspectEnd() {
+        return mEnd;
+    }
+
+    public void bindNetworkStats(NetworkStatsHistory network) {
+        mNetwork = network;
+        notifyChanged();
+    }
+
+    public void setColors(int seriesColor, int secondaryColor) {
+        mSeriesColor = seriesColor;
+        mSecondaryColor = secondaryColor;
+        notifyChanged();
+    }
+}