Implement the new Photo picker, part two.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmap.java

+// Copyright 2017 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.chrome.browser.photo_picker;
+
+import android.support.annotation.IntDef;
+
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.base.annotations.SuppressFBWarnings;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * A class to keep track of the meta data associated with a an image in the photo picker.
+ */
+@SuppressFBWarnings("EQ_COMPARETO_USE_OBJECT_EQUALS")
+public class PickerBitmap implements Comparable<PickerBitmap> {
+    // The possible types of tiles involved in the viewer.
+    @IntDef({PICTURE, CAMERA, GALLERY})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface TileTypes {}
+    public static final int PICTURE = 0;
+    public static final int CAMERA = 1;
+    public static final int GALLERY = 2;
+
+    // The file path to the bitmap to show.
+    private String mFilePath;
+
+    // When the bitmap was last modified on disk.
+    private long mLastModified;
+
+    // The type of tile involved.
+    @TileTypes
+    private int mType;
+
+    /**
+     * The PickerBitmap constructor.
+     * @param filePath The file path to the bitmap to show.
+     * @param lastModified When the bitmap was last modified on disk.
+     * @param type The type of tile involved.
+     */
+    public PickerBitmap(String filePath, long lastModified, @TileTypes int type) {
+        mFilePath = filePath;
+        mLastModified = lastModified;
+        mType = type;
+    }
+
+    /**
+     * Accessor for the filepath.
+     * @return The file path for this PickerBitmap object.
+     */
+    public String getFilePath() {
+        return mFilePath;
+    }
+
+    /**
+     * Accessor for the tile type.
+     * @return The type of tile involved for this bitmap object.
+     */
+    @TileTypes
+    public int type() {
+        return mType;
+    }
+
+    /**
+     * A comparison function for PickerBitmaps (results in a last-modified first sort).
+     * @param other The PickerBitmap to compare it to.
+     * @return 0, 1, or -1, depending on which is bigger.
+     */
+    @Override
+    public int compareTo(PickerBitmap other) {
+        return ApiCompatibilityUtils.compareLong(other.mLastModified, mLastModified);
+    }
+}