Implement the new Photo picker, part two.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PhotoPickerDialog.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.content.Context;
+import android.os.Bundle;
+import android.support.v7.app.AlertDialog;
+import android.view.ViewGroup.LayoutParams;
+import android.view.WindowManager;
+
+import org.chromium.chrome.R;
+import org.chromium.ui.PhotoPickerListener;
+
+/**
+ * UI for the photo chooser that shows on the Android platform as a result of
+ * <input type=file accept=image > form element.
+ */
+public class PhotoPickerDialog extends AlertDialog {
+    // The category we're showing photos for.
+    private PickerCategoryView mCategoryView;
+
+    /**
+     * The PhotoPickerDialog constructor.
+     * @param context The context to use.
+     * @param listener The listener object that gets notified when an action is taken.
+     * @param multiSelectionAllowed True if the photo picker should allow multiple items to be
+     *    selected.

[Ted C, 2017/04/06 23:52:15]

Nit.

For multi-line javadoc, we should align with the text after the boilerplate
(i.e. "True if the ..."), for @return, you would align the text with what is
right after the @return for example.

As an even more nit of nits, I prefer to use whether for boolean statements
which would read like "Whether the photo picker should...".

[Finnur, 2017/04/07 13:52:20]

Done.

+     */
+    public PhotoPickerDialog(
+            Context context, PhotoPickerListener listener, boolean multiSelectionAllowed) {
+        super(context, R.style.FullscreenWhite);
+
+        // Initialize the main content view.
+        mCategoryView = new PickerCategoryView(context);
+        mCategoryView.initialize(this, listener, multiSelectionAllowed);
+        setView(mCategoryView);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        getWindow().setLayout(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                WindowManager.LayoutParams.FLAG_FULLSCREEN);
+    }
+}