Upstream the iOS web_shell and supporting code

ios/web/shell/app_delegate.mm

Index: ios/web/shell/app_delegate.mm
diff --git a/ios/web/shell/app_delegate.mm b/ios/web/shell/app_delegate.mm
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index 0000000000000000000000000000000000000000..0bba03c7f24dd37d5977e26e8b3ecf3b0c9ba23b
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+++ b/ios/web/shell/app_delegate.mm
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+// Copyright 2014 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 "ios/web/shell/app_delegate.h"
+
+#import "base/mac/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
+#include "ios/web/public/app/web_main.h"
+#include "ios/web/public/web_client.h"
+#include "ios/web/public/web_state/web_state.h"
+#include "ios/web/shell/shell_browser_state.h"
+#include "ios/web/shell/shell_main_delegate.h"
+#include "ios/web/shell/shell_web_client.h"
+#import "ios/web/shell/view_controller.h"
+
+@interface AppDelegate () {
+  scoped_ptr<web::ShellMainDelegate> _delegate;
+  scoped_ptr<web::WebMain> _webMain;
+}
+@end
+
+@implementation AppDelegate
+
+@synthesize window = _window;
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  self.window.backgroundColor = [UIColor whiteColor];
+
+  _delegate.reset(new web::ShellMainDelegate());
+  web::WebMainParams params(_delegate.get());
+  _webMain.reset(new web::WebMain(params));
+
+  web::ShellWebClient* client =
+      static_cast<web::ShellWebClient*>(web::GetWebClient());
+  web::BrowserState* browserState = client->browser_state();
+
+  base::scoped_nsobject<ViewController> controller(
+      [[ViewController alloc] initWithBrowserState:browserState]);
+  self.window.rootViewController = controller;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+- (void)applicationWillResignActive:(UIApplication*)application {
+}
+
+- (void)applicationDidEnterBackground:(UIApplication*)application {
+}
+
+- (void)applicationWillEnterForeground:(UIApplication*)application {
+}
+
+- (void)applicationDidBecomeActive:(UIApplication*)application {
+}
+
+- (void)applicationWillTerminate:(UIApplication*)application {
+  _webMain.reset();
+  _delegate.reset();
+}
+
+@end