Add third_party/android_data_chart for data chart widget.

third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartGridView.java

Index: third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartGridView.java
diff --git a/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartGridView.java b/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartGridView.java
new file mode 100644
index 0000000000000000000000000000000000000000..971c23df0aee4d998029a29cbfe75d11bd161203
--- /dev/null
+++ b/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartGridView.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2013 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 org.chromium.third_party.android.datausagechart;
+
+import static android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
+import static android.text.format.DateUtils.FORMAT_SHOW_DATE;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.text.format.DateUtils;
+import android.util.AttributeSet;
+import android.view.View;
+
+import org.chromium.third_party.android.R;
+
+import java.util.Locale;
+
+/**
+ * Background of {@link ChartView} that renders grid lines as requested by
+ * {@link ChartAxis#getTickPoints()}.
+ * This is derived from com.android.settings.widget.ChartGridView.
+ */
+public class ChartGridView extends View {
+
+    private ChartAxis mHoriz;
+    private ChartAxis mVert;
+
+    private Drawable mPrimary;
+    private Drawable mSecondary;
+    private Drawable mBorder;
+
+    public static String formatDateRange(Context context, long start, long end) {
+        final int flags = FORMAT_SHOW_DATE | FORMAT_ABBREV_MONTH;
+        final StringBuilder builder = new StringBuilder(50);
+        final java.util.Formatter formatter = new java.util.Formatter(
+                builder, Locale.getDefault());
+        return DateUtils.formatDateRange(context, formatter, start, end, flags, null).toString();
+    }
+
+    public ChartGridView(Context context) {
+        this(context, null, 0);
+    }
+
+    public ChartGridView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ChartGridView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        setWillNotDraw(false);
+
+        final TypedArray a = context.obtainStyledAttributes(
+                attrs, R.styleable.ChartGridView, defStyle, 0);
+
+        mPrimary = a.getDrawable(R.styleable.ChartGridView_primaryDrawable);
+        mSecondary = a.getDrawable(R.styleable.ChartGridView_secondaryDrawable);
+        mBorder = a.getDrawable(R.styleable.ChartGridView_borderDrawable);
+        a.recycle();
+    }
+
+    void init(ChartAxis horiz, ChartAxis vert) {
+        if (horiz == null) throw new NullPointerException("missing horiz");
+        if (vert == null) throw new NullPointerException("missing vert");
+        mHoriz = horiz;
+        mVert = vert;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        final int width = getWidth();
+        final int height = getHeight();
+
+        final Drawable secondary = mSecondary;
+        float density = getResources().getDisplayMetrics().density;
+        final int secondaryHeight = Math.max(1, Math.round(density));
+
+        final float[] vertTicks = mVert.getTickPoints();
+        for (float y : vertTicks) {
+            final int bottom = (int) Math.min(y + secondaryHeight, height);
+            secondary.setBounds(0, (int) y, width, bottom);
+            secondary.draw(canvas);
+        }
+
+        final Drawable primary = mPrimary;
+        final int primaryWidth = secondaryHeight;
+
+        final float[] horizTicks = mHoriz.getTickPoints();
+        for (float x : horizTicks) {
+            final int right = (int) Math.min(x + primaryWidth, width);
+            primary.setBounds((int) x, 0, right, height);
+            primary.draw(canvas);
+        }
+
+        mBorder.setBounds(0, 0, width, height);
+        mBorder.draw(canvas);
+    }
+}