Update ExtensionInstallChecker to use PreloadCheck classes

extensions/browser/preload_check_test_util.cc

 // Copyright 2017 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 "extensions/browser/preload_check_test_util.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "extensions/common/extension.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
+// PreloadCheckRunner:
 PreloadCheckRunner::PreloadCheckRunner() : called_(false) {}
 PreloadCheckRunner::~PreloadCheckRunner() {}
 
 void PreloadCheckRunner::OnCheckComplete(PreloadCheck::Errors errors) {
   ASSERT_FALSE(called_);
   called_ = true;
   errors_ = errors;
   if (run_loop_)
     run_loop_->Quit();
 }
@@ skipping 14 matching lines @@
 PreloadCheck::ResultCallback PreloadCheckRunner::GetCallback() {
   return base::Bind(&PreloadCheckRunner::OnCheckComplete,
                     base::Unretained(this));
 }
 
 void PreloadCheckRunner::WaitForIdle() {
   run_loop_ = base::MakeUnique<base::RunLoop>();
   run_loop_->RunUntilIdle();
 }
 
+// PreloadCheckStub:
+PreloadCheckStub::PreloadCheckStub(bool is_async)
+    : PreloadCheck(nullptr), is_async_(is_async) {}
+
+PreloadCheckStub::~PreloadCheckStub() {}
+
+void PreloadCheckStub::AddError(Error error) {
+  errors_.insert(error);
+}
+
+void PreloadCheckStub::Start(ResultCallback callback) {
+  DCHECK(!callback.is_null());
+  if (is_async_) {
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(&PreloadCheckStub::StartInternal,
+                              base::Unretained(this), base::Passed(&callback)));
+  } else {
+    StartInternal(std::move(callback));
+  }
+}
+
+void PreloadCheckStub::StartInternal(ResultCallback callback) {
+  std::move(callback).Run(errors_);
+}
+
+base::string16 PreloadCheckStub::GetErrorMessage() const {
+  return message_;
+}
+
 }  // namespace extensions