WIP : Generic Sensor API implementation

device/sensors/android/java/src/org/chromium/device/sensors/SensorConfigurations.java

Index: device/sensors/android/java/src/org/chromium/device/sensors/SensorConfigurations.java
diff --git a/device/sensors/android/java/src/org/chromium/device/sensors/SensorConfigurations.java b/device/sensors/android/java/src/org/chromium/device/sensors/SensorConfigurations.java
new file mode 100644
index 0000000000000000000000000000000000000000..0571c97683073c9451c6af1b083a9351b3b33173
--- /dev/null
+++ b/device/sensors/android/java/src/org/chromium/device/sensors/SensorConfigurations.java
@@ -0,0 +1,55 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.device.sensors;
+
+import org.chromium.mojom.device.sensors.SensorConfiguration;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+/**
+ * Generic list of configurations.
+ */
+public class SensorConfigurations extends ArrayList<SensorConfiguration> {
+    private final Comparator<SensorConfiguration> mComparator;
+
+    SensorConfigurations() {
+        super();
+        mComparator = new SensorConfigurationComparator();
+    }
+
+    SensorConfigurations(Comparator<SensorConfiguration> comparator) {
+        super();
+        mComparator = comparator;
+    }
+
+    private static class SensorConfigurationComparator implements Comparator<SensorConfiguration> {
+        @Override
+        public int compare(SensorConfiguration lhs, SensorConfiguration rhs) {
+            if (lhs.frequency == rhs.frequency)
+                return 0;
+            else if (rhs.frequency > lhs.frequency)
+                return 1;
+            else
+                return -1;
+        }
+    };
+
+    public boolean add(SensorConfiguration configuration) {
+        if (configuration == null) return false;
+        boolean result = super.add(configuration);
+        if (result) Collections.sort(this, mComparator);
+        return result;
+    }
+
+    public boolean remove(SensorConfiguration configuration) {
+        if (configuration == null) return false;
+        if (!super.remove(configuration)) return false;
+        Collections.sort(this, mComparator);
+        return true;
+    }
+};