Upstream the iOS web_shell and supporting code

ios/web/app/web_main_runner.mm

Index: ios/web/app/web_main_runner.mm
diff --git a/ios/web/app/web_main_runner.mm b/ios/web/app/web_main_runner.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.
+
+#include "ios/web/app/web_main_runner.h"
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/i18n/icu_util.h"
+#include "base/logging.h"
+#include "base/metrics/statistics_recorder.h"
+#include "ios/web/app/web_main_loop.h"
+#include "ios/web/public/web_client.h"
+#include "ui/base/ui_base_paths.h"
+
+namespace web {
+
+class WebMainRunnerImpl : public WebMainRunner {
+ public:
+  WebMainRunnerImpl()
+      : is_initialized_(false),
+        is_shutdown_(false),
+        completed_basic_startup_(false),
+        delegate_(nullptr) {}
+
+  ~WebMainRunnerImpl() override {
+    if (is_initialized_ && !is_shutdown_) {
+      ShutDown();
+    }
+  }
+
+  int Initialize(const WebMainParams& params) override {
+    ////////////////////////////////////////////////////////////////////////
+    // ContentMainRunnerImpl::Initialize()
+    //
+    is_initialized_ = true;
+    delegate_ = params.delegate;
+
+    // TODO(rohitrao): Chrome for iOS initializes this in main(), because it's
+    // needed for breakpad.  Are we really going to require that all embedders
+    // initialize an AtExitManager in main()?
+    exit_manager_.reset(new base::AtExitManager);
+
+    // There is no way to pass commandline flags to process on iOS, so the
+    // CommandLine is always initialized empty.  Embedders can add switches in
+    // |BasicStartupComplete|.
+    base::CommandLine::Init(0, nullptr);
+    if (delegate_) {
+      delegate_->BasicStartupComplete();
+    }
+    completed_basic_startup_ = true;
+
+    // TODO(rohitrao): Should we instead require that all embedders call
+    // SetWebClient()?
+    if (!GetWebClient())
+      SetWebClient(&empty_web_client_);
+
+#if defined(USE_NSS)
+    crypto::EarlySetupForNSSInit();
+#endif
+
+    // TODO(rohitrao): Desktop calls content::RegisterContentSchemes(true) here.
+    // Do we need similar scheme registration on iOS?
+    ui::RegisterPathProvider();
+
+    CHECK(base::i18n::InitializeICU());
+
+    ////////////////////////////////////////////////////////////
+    //  BrowserMainRunnerImpl::Initialize()
+    base::StatisticsRecorder::Initialize();
+
+    main_loop_.reset(new WebMainLoop());
+    main_loop_->Init();
+    main_loop_->EarlyInitialization();
+    main_loop_->MainMessageLoopStart();
+    main_loop_->CreateStartupTasks();
+    int result_code = main_loop_->GetResultCode();
+    if (result_code > 0)
+      return result_code;
+
+    // Return -1 to indicate no early termination.
+    return -1;
+  }
+
+  void ShutDown() override {
+    ////////////////////////////////////////////////////////////////////
+    // BrowserMainRunner::Shutdown()
+    //
+    DCHECK(is_initialized_);
+    DCHECK(!is_shutdown_);
+    main_loop_->ShutdownThreadsAndCleanUp();
+    main_loop_.reset(nullptr);
+
+    ////////////////////////////////////////////////////////////////////
+    // ContentMainRunner::Shutdown()
+    //
+    if (completed_basic_startup_ && delegate_) {
+      delegate_->ProcessExiting();
+    }
+
+    exit_manager_.reset(nullptr);
+    delegate_ = nullptr;
+    is_shutdown_ = true;
+  }
+
+ protected:
+  // True if we have started to initialize the runner.
+  bool is_initialized_;
+
+  // True if the runner has been shut down.
+  bool is_shutdown_;
+
+  // True if basic startup was completed.
+  bool completed_basic_startup_;
+
+  // The delegate will outlive this object.
+  WebMainDelegate* delegate_;
+
+  // Used if the embedder doesn't set one.
+  WebClient empty_web_client_;
+
+  scoped_ptr<base::AtExitManager> exit_manager_;
+  scoped_ptr<WebMainLoop> main_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebMainRunnerImpl);
+};
+
+// static
+WebMainRunner* WebMainRunner::Create() {
+  return new WebMainRunnerImpl();
+}
+
+}  // namespace web