Implement the new Photo picker, part two.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PhotoPickerDialog.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PhotoPickerDialog.java b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PhotoPickerDialog.java
new file mode 100644
index 0000000000000000000000000000000000000000..bc8ea4a161484e63c646d37a594697f5c09f6fb4
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+++ b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PhotoPickerDialog.java
@@ -0,0 +1,48 @@
+// 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 multiSelection True if the photo picker should allow multiple items to be selected.
+     */
+    public PhotoPickerDialog(
+            Context context, PhotoPickerListener listener, boolean multiSelection) {
+        super(context, R.style.FullscreenWhite);
+
+        // Initialize the main content view.
+        mCategoryView = new PickerCategoryView(context);
+        mCategoryView.setStartingState(this, listener, multiSelection);
+        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);
+    }
+}