Implement the new Photo picker, part one.

ui/android/java/src/org/chromium/ui/PhotoPickerListener.java

Index: ui/android/java/src/org/chromium/ui/PhotoPickerListener.java
diff --git a/ui/android/java/src/org/chromium/ui/PhotoPickerListener.java b/ui/android/java/src/org/chromium/ui/PhotoPickerListener.java
new file mode 100644
index 0000000000000000000000000000000000000000..8a8a1d9b125c32c70649c7fd70d5a0c1710aad26
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+++ b/ui/android/java/src/org/chromium/ui/PhotoPickerListener.java
@@ -0,0 +1,45 @@
+// 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.ui;
+
+import android.support.annotation.Nullable;
+
+import java.util.Map;
+
+/**
+ * The callback used to indicate what action the user took in the picker.
+ */
+public interface PhotoPickerListener {
+    /**
+     * The action the user took in the picker.
+     */
+    enum Action {
+        PHOTOS_SELECTED,
+        LAUNCH_CAMERA,
+        LAUNCH_GALLERY,
+    }
+
+    /**
+     * The types of requests supported.
+     */
+    static final int TAKE_PHOTO_REQUEST = 1;
+    static final int SHOW_GALLERY = 2;
+
+    /**
+     * Called when the user has selected an action. For possible actions see above.
+     *
+     * @param photos The photos that were selected.
+     */
+    void onPickerUserAction(Action action, String[] photos);
+
+    /**
+     * Used during testing to provide pre-canned data to the dialog.
+     *
+     * @return The test files to use (Map<String, Long>, mapping file paths to creation times) or
+     *     null when run outside of a test.
+     */
+    @Nullable
+    Map<String, Long> getFilesForTesting();
+}