Basic Sky shell for iOS targets

sky/shell/ios/sky_app_delegate.mm

Index: sky/shell/ios/sky_app_delegate.mm
diff --git a/sky/shell/ios/sky_app_delegate.mm b/sky/shell/ios/sky_app_delegate.mm
new file mode 100644
index 0000000000000000000000000000000000000000..ff7449daaa9c1e1549f3f6aa1c883511b4fb1677
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+++ b/sky/shell/ios/sky_app_delegate.mm
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+// 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.
+
+#import "sky_app_delegate.h"
+#import "sky_view_controller.h"
+
+#include "sky/shell/shell.h"
+#include "sky/shell/service_provider.h"
+#include "sky/shell/ui_delegate.h"
+#include "base/lazy_instance.h"
+#include "base/message_loop/message_loop.h"
+
+@implementation SkyAppDelegate {
+  base::LazyInstance<scoped_ptr<base::MessageLoop>> _main_message_loop;
+}
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  [self setupSkyShell];
+  [self setupViewport];
+
+  return YES;
+}
+
+- (void)setupSkyShell {
+  [self adoptPlatformRunLoop];
+
+  auto service_provider_context =
+      make_scoped_ptr(new sky::shell::ServiceProviderContext(
+          _main_message_loop.Get()->task_runner()));
+  sky::shell::Shell::Init(service_provider_context.Pass());
+}
+
+- (void)adoptPlatformRunLoop {
+  _main_message_loop.Get().reset(new base::MessageLoopForUI);
+  // One cannot start the message loop on the platform main thread. Instead,
+  // we attach to the CFRunLoop
+  base::MessageLoopForUI::current()->Attach();
+}
+
+- (void)setupViewport {
+  CGRect frame = [UIScreen mainScreen].bounds;
+  UIWindow* window = [[UIWindow alloc] initWithFrame:frame];
+  SkyViewController* viewController = [[SkyViewController alloc] init];
+  window.rootViewController = viewController;
+  [viewController release];
+  self.window = window;
+  [window release];
+  [self.window makeKeyAndVisible];
+}
+
+@end