Add third_party/android_data_chart for data chart widget.

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

Index: third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartAxis.java
diff --git a/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartAxis.java b/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartAxis.java
new file mode 100644
index 0000000000000000000000000000000000000000..e2f293b463165f7153a2e6b9d3fae330571b9188
--- /dev/null
+++ b/third_party/android_data_chart/java/src/org/chromium/third_party/android/datausagechart/ChartAxis.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 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 android.content.res.Resources;
+import android.text.SpannableStringBuilder;
+
+/**
+ * Axis along a {@link ChartView} that knows how to convert between raw point
+ * and screen coordinate systems.
+ * Derived from com.android.settings.widget.ChartAxis
+ */
+public interface ChartAxis {
+
+    /** Set range of raw values this axis should cover. */
+    public boolean setBounds(long min, long max);
+    /** Set range of screen points this axis should cover. */
+    public boolean setSize(float size);
+
+    /** Convert raw value into screen point. */
+    public float convertToPoint(long value);
+    /** Convert screen point into raw value. */
+    public long convertToValue(float point);
+
+    /**
+     * Build label that describes given raw value. If the label is rounded for
+     * display, return the rounded value.
+     */
+    public long buildLabel(Resources res, SpannableStringBuilder builder, long value);
+
+    /** Return list of tick points for drawing a grid. */
+    public float[] getTickPoints();
+
+    /**
+     * Test if given raw value should cause the axis to grow or shrink;
+     * returning positive value to grow and negative to shrink.
+     */
+    public int shouldAdjustAxis(long value);
+
+}