Upon execution of the App Host, ask Omaha to install the Chrome Binaries if they are not present on…

chrome/browser/extensions/app_host/binaries_installer.cc

+// 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 "chrome/browser/extensions/app_host/binaries_installer.h"
+
+#include "base/logging.h"
+#include "base/threading/platform_thread.h"
+#include "base/win/scoped_bstr.h"
+#include "base/win/scoped_comptr.h"
+#include "chrome/browser/extensions/app_host/binaries_installer_internal.h"
+#include "google_update/google_update_idl.h"
+
+using base::win::ScopedBstr;
+using base::win::ScopedComPtr;
+
+namespace app_host {
+
+namespace {
+const int kInstallationPollingIntervalMs = 50;
+}  // namespace
+
+// Attempts to install the Chrome Binaries using the IGoogleUpdate3 interface.
+// Blocks until the installation process completes, without message pumping.

[robertshield, 2012/08/16 13:08:16]

What's the end state of the Omaha registry keys if this fails? Does it leave
behind any binaries-related keys in Clients or ClientState?

[erikwright (departed), 2012/08/16 21:05:15]

It's presumably the equivalent of a failure after a download of the tagged meta
installer.

+HRESULT InstallBinaries() {
+  HRESULT hr = ::CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

[robertshield, 2012/08/16 13:08:16]

Suggest using the stuff in base/win/scoped_com_initializer.h

[erikwright (departed), 2012/08/16 21:05:15]

I was shocked such a thing didn't exist, but I guess I missed this one in my
grepping somehow.

+  if (FAILED(hr)) {
+    LOG(ERROR) << "CoInitializeEx failed: " << hr;
+    return hr;
+  }
+
+  // After this point, don't return until CoUninitialize is called.
+
+  ScopedComPtr<IGoogleUpdate3> update3;
+  if (SUCCEEDED(hr)) {
+    hr = internal::CreateGoogleUpdate3(update3.Receive());
+  }
+
+  ScopedBstr ap_value;
+  if (SUCCEEDED(hr)) {
+    hr = internal::SelectBinariesApValue(update3, ap_value.Receive());
+  }
+
+  ScopedComPtr<IAppBundle> app_bundle;
+  if (SUCCEEDED(hr)) {
+    hr = internal::CreateAppBundle(update3, app_bundle.Receive());
+  }
+
+  ScopedComPtr<IApp> app;
+  if (SUCCEEDED(hr)) {
+    hr = internal::CreateBinariesIApp(app_bundle, ap_value, app.Receive());
+  }
+
+  if (SUCCEEDED(hr)) {
+    hr = app_bundle->checkForUpdate();
+    if (FAILED(hr)) {
+      LOG(ERROR) << "Failed to initiate update check: " << hr;
+    }
+  }
+
+  if (SUCCEEDED(hr)) {
+    while (!internal::CheckIfDone(app_bundle, app, &hr)) {
+      base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(
+          kInstallationPollingIntervalMs));
+    }
+  }
+
+  ::CoUninitialize();
+  return hr;
+}
+
+}  // namespace app_host