Integrate the Windows 8 code into the Chromium tree.

win8/delegate_execute/delegate_execute.cc

Index: win8/delegate_execute/delegate_execute.cc
diff --git a/win8/delegate_execute/delegate_execute.cc b/win8/delegate_execute/delegate_execute.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9f3430c7ed63aee871bd1dcfde83167583b89d36
--- /dev/null
+++ b/win8/delegate_execute/delegate_execute.cc
@@ -0,0 +1,120 @@
+// Copyright (c) 2012 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 <atlbase.h>
+#include <atlcom.h>
+#include <atlctl.h>
+#include <initguid.h>
+#include <shellapi.h>
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/string16.h"
+#include "base/string_number_conversions.h"
+#include "base/utf_string_conversions.h"
+#include "base/win/scoped_com_initializer.h"
+#include "base/win/scoped_handle.h"
+#include "chrome/common/chrome_switches.h"
+#include "command_execute_impl.h"
+#include "win8/delegate_execute/delegate_execute_operation.h"
+#include "win8/delegate_execute/resource.h"
+
+using namespace ATL;
+
+class DelegateExecuteModule
+    : public ATL::CAtlExeModuleT< DelegateExecuteModule > {
+ public :
+  typedef ATL::CAtlExeModuleT<DelegateExecuteModule> ParentClass;
+
+  DECLARE_REGISTRY_APPID_RESOURCEID(IDR_DELEGATEEXECUTE,
+                                    "{B1935DA1-112F-479A-975B-AB8588ABA636}")
+
+  virtual HRESULT AddCommonRGSReplacements(IRegistrarBase* registrar) throw() {
+    AtlTrace(L"In %hs\n", __FUNCTION__);
+    HRESULT hr = ParentClass::AddCommonRGSReplacements(registrar);
+    if (FAILED(hr))
+      return hr;
+
+    wchar_t delegate_execute_clsid[MAX_PATH] = {0};
+    if (!StringFromGUID2(__uuidof(CommandExecuteImpl), delegate_execute_clsid,
+                         ARRAYSIZE(delegate_execute_clsid))) {
+      ATLASSERT(false);
+      return E_FAIL;
+    }
+
+    hr = registrar->AddReplacement(L"DELEGATE_EXECUTE_CLSID",
+                                   delegate_execute_clsid);
+    ATLASSERT(SUCCEEDED(hr));
+    return hr;
+  }
+};
+
+DelegateExecuteModule _AtlModule;
+
+// Relaunch metro Chrome by ShellExecute on |shortcut| with --force-immersive.
+// |handle_value| is an optional handle on which this function will wait before
+// performing the relaunch.
+int RelaunchChrome(const FilePath& shortcut, const string16& handle_value) {
+  base::win::ScopedHandle handle;
+
+  if (!handle_value.empty()) {
+    uint32 the_handle = 0;
+    if (!base::StringToUint(handle_value, &the_handle)) {
+      // Failed to parse the handle value.  Skip the wait but proceed with the
+      // relaunch.
+      AtlTrace(L"Failed to parse handle value %ls\n", handle_value.c_str());
+    } else {
+      handle.Set(reinterpret_cast<HANDLE>(the_handle));
+    }
+  }
+
+  if (handle.IsValid()) {
+    AtlTrace(L"Waiting for chrome.exe to exit.\n");
+    DWORD result = ::WaitForSingleObject(handle, 10 * 1000);
+    AtlTrace(L"And we're back.\n");
+    if (result != WAIT_OBJECT_0) {
+      AtlTrace(L"Failed to wait for parent to exit; result=%u.\n", result);
+      // This could mean that Chrome has hung.  Conservatively proceed with
+      // the relaunch anyway.
+    }
+    handle.Close();
+  }
+
+  base::win::ScopedCOMInitializer com_initializer;
+
+  AtlTrace(L"Launching Chrome via %ls.\n", shortcut.value().c_str());
+  int ser = reinterpret_cast<int>(
+      ::ShellExecute(NULL, NULL, shortcut.value().c_str(),
+                     ASCIIToWide(switches::kForceImmersive).c_str(), NULL,
+                     SW_SHOWNORMAL));
+  AtlTrace(L"ShellExecute returned %d.\n", ser);
+  return ser <= 32;
+}
+
+//
+extern "C" int WINAPI _tWinMain(HINSTANCE , HINSTANCE,
+                                LPTSTR, int nShowCmd) {
+  using delegate_execute::DelegateExecuteOperation;
+  base::AtExitManager exit_manager;
+
+  CommandLine::Init(0, NULL);
+  CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  DelegateExecuteOperation operation;
+
+  operation.Initialize(cmd_line);
+  switch (operation.operation_type()) {
+    case DelegateExecuteOperation::EXE_MODULE:
+      return _AtlModule.WinMain(nShowCmd);
+
+    case DelegateExecuteOperation::RELAUNCH_CHROME:
+      return RelaunchChrome(operation.relaunch_shortcut(),
+          cmd_line->GetSwitchValueNative(switches::kWaitForHandle));
+
+    default:
+      NOTREACHED();
+  }
+
+  return 1;
+}