Add support for scroll and fling gestures to SkyShell.

sky/shell/BUILD.gn

 # 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.
 
 assert(is_android)
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 generate_jni("jni_headers") {
@@ skipping 54 matching lines @@
     "//sky/services/platform",
     "//sky/services/viewport",
     "//ui/gfx/geometry",
     "//ui/gl",
     ":jni_headers",
   ]
 }
 
 android_library("java") {
   java_files = [
+    "org/domokit/sky/shell/GestureProvider.java",
     "org/domokit/sky/shell/JavaServiceProvider.java",
     "org/domokit/sky/shell/PlatformView.java",
-    "org/domokit/sky/shell/SkyMain.java",
     "org/domokit/sky/shell/SkyActivity.java",
     "org/domokit/sky/shell/SkyApplication.java",
+    "org/domokit/sky/shell/SkyMain.java",
   ]
 
   deps = [
     "//base:base_java",
     "//mojo/android:system_java",
     "//mojo/public/interfaces/application:application_java",
     "//mojo/public/java:bindings",
     "//mojo/public/java:system",
     "//mojo/services/network/public/interfaces:interfaces_java",
     "//sky/services/oknet",
     "//sky/services/sensors",
     "//sky/services/sensors:interfaces_java",
     "//sky/services/viewport:viewport_java",
   ]
 }
 
 copy_ex("assets") {
   clear_dir = true
   dest = "$root_build_dir/sky_shell/assets"
   sources = [
     "$root_build_dir/icudtl.dat",
   ]
   deps = [
     "//third_party/icu",
   ]
 }