Add ViewConfiguration and make our scrollbar size match Android

sky/framework/view-configuration.dart

Index: sky/framework/view-configuration.dart
diff --git a/sky/framework/view-configuration.dart b/sky/framework/view-configuration.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5100d9cdbcc790753e19e8d6ded459cb2c764ea4
--- /dev/null
+++ b/sky/framework/view-configuration.dart
@@ -0,0 +1,12 @@
+// Copyright 2015 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.
+
+// Modeled after Android's ViewConfiguration:
+// https://github.com/android/platform_frameworks_base/blob/master/core/java/android/view/ViewConfiguration.java
+
+class ViewConfiguration {
+    final int kScrollbarSize = 10;
+    final int kScrollbarFadeDelay = 300;
+    final int kScrollbarFadeDuration = 250;
+}

[abarth-chromium, 2015/02/24 21:48:25]

Why not just have top-level constants in this file?  We don't need a class to
contain them because Dart is more flexible than Java.