Add ModuleInspector

chrome/browser/conflicts/module_inspector_win.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 "chrome/browser/conflicts/module_inspector_win.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/task_scheduler/post_task.h"
+
+namespace {
+
+StringMapping GetPathMapping() {
+  return GetEnvironmentVariablesMapping({
+      L"LOCALAPPDATA", L"ProgramFiles", L"ProgramData", L"USERPROFILE",
+      L"SystemRoot", L"TEMP", L"TMP", L"CommonProgramFiles",
+  });
+}
+
+}  // namespace
+
+ModuleInspector::ModuleInspector(
+    const OnModuleInspectedCallback& on_module_inspected_callback)
+    : on_module_inspected_callback_(on_module_inspected_callback),
+      inspection_task_traits_(
+          base::TaskTraits()
+              .MayBlock()
+              .WithPriority(base::TaskPriority::BACKGROUND)
+              .WithShutdownBehavior(
+                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)),
+      path_mapping_(GetPathMapping()),
+      weak_ptr_factory_(this) {}
+
+ModuleInspector::~ModuleInspector() = default;
+
+void ModuleInspector::AddModule(const ModuleInfoKey& module_key) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  queue_.push(module_key);
+  if (queue_.size() == 1)
+    StartInspectingModule();
+}
+
+void ModuleInspector::IncreaseInspectionPriority() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  // Modify the task traits so that future inspections are done faster.
+  inspection_task_traits_ =
+      inspection_task_traits_.WithPriority(base::TaskPriority::USER_VISIBLE);
+}
+
+void ModuleInspector::StartInspectingModule() {
+  ModuleInfoKey module_key = queue_.front();
+  queue_.pop();
+
+  base::PostTaskWithTraitsAndReplyWithResult(

[chrisha, 2017/03/04 16:09:07]

That's convenient! Wasn't aware of this variant of PostTask.

+      FROM_HERE, inspection_task_traits_,
+      base::Bind(&InspectModule, path_mapping_, module_key),
+      base::Bind(&ModuleInspector::OnInspectionFinished,
+                 weak_ptr_factory_.GetWeakPtr(), module_key));
+}
+
+void ModuleInspector::OnInspectionFinished(
+    const ModuleInfoKey& module_key,
+    std::unique_ptr<ModuleInspectionResult> inspection_result) {
+  on_module_inspected_callback_.Run(module_key, std::move(inspection_result));
+
+  // Continue the work.
+  if (!queue_.empty())
+    StartInspectingModule();
+}