Use PreloadCheckGroup in ExtensionInstallChecker. Make RequirementsChecker a PreloadCheck.

chrome/browser/extensions/chrome_requirements_checker.cc

Index: chrome/browser/extensions/chrome_requirements_checker.cc
diff --git a/chrome/browser/extensions/chrome_requirements_checker.cc b/chrome/browser/extensions/chrome_requirements_checker.cc
deleted file mode 100644
index 87934911466c807f3e3a58ba78061844b2733006..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/chrome_requirements_checker.cc
+++ /dev/null
@@ -1,89 +0,0 @@
-// 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/chrome_requirements_checker.h"
-
-#include "base/bind.h"
-#include "build/build_config.h"
-#include "chrome/grit/generated_resources.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/gpu_feature_checker.h"
-#include "extensions/common/extension.h"
-#include "extensions/common/manifest.h"
-#include "extensions/common/manifest_handlers/requirements_info.h"
-#include "gpu/config/gpu_feature_type.h"
-#include "ui/base/l10n/l10n_util.h"
-
-namespace extensions {
-
-ChromeRequirementsChecker::ChromeRequirementsChecker()
-    : pending_requirement_checks_(0), weak_ptr_factory_(this) {
-}
-
-ChromeRequirementsChecker::~ChromeRequirementsChecker() {
-}
-
-void ChromeRequirementsChecker::Check(
-    const scoped_refptr<const Extension>& extension,
-    const RequirementsCheckedCallback& callback) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-
-  callback_ = callback;
-  const RequirementsInfo& requirements =
-      RequirementsInfo::GetRequirements(extension.get());
-
-  if (requirements.npapi) {
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-    errors_.push_back(
-        l10n_util::GetStringUTF8(IDS_EXTENSION_NPAPI_NOT_SUPPORTED));
-#endif
-  }
-
-  if (requirements.window_shape) {
-#if !defined(USE_AURA)
-    errors_.push_back(
-        l10n_util::GetStringUTF8(IDS_EXTENSION_WINDOW_SHAPE_NOT_SUPPORTED));
-#endif
-  }
-
-  if (requirements.webgl) {
-    ++pending_requirement_checks_;
-    webgl_checker_ = content::GpuFeatureChecker::Create(
-        gpu::GPU_FEATURE_TYPE_WEBGL,
-        base::Bind(&ChromeRequirementsChecker::SetWebGLAvailability,
-                   weak_ptr_factory_.GetWeakPtr()));
-  }
-
-  if (pending_requirement_checks_ == 0) {
-    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
-                                     base::Bind(callback_, errors_));
-    // Reset the callback so any ref-counted bound parameters will get released.
-    callback_.Reset();
-    return;
-  }
-  // Running the GPU checkers down here removes any race condition that arises
-  // from the use of pending_requirement_checks_.
-  if (webgl_checker_.get())
-    webgl_checker_->CheckGpuFeatureAvailability();
-}
-
-void ChromeRequirementsChecker::SetWebGLAvailability(bool available) {
-  if (!available) {
-    errors_.push_back(
-        l10n_util::GetStringUTF8(IDS_EXTENSION_WEBGL_NOT_SUPPORTED));
-  }
-  MaybeRunCallback();
-}
-
-void ChromeRequirementsChecker::MaybeRunCallback() {
-  if (--pending_requirement_checks_ == 0) {
-    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
-                                     base::Bind(callback_, errors_));
-    // Reset the callback so any ref-counted bound parameters will get released.
-    callback_.Reset();
-    errors_.clear();
-  }
-}
-
-}  // namespace extensions