MD Settings: implement "RESTART" button for hardware acceleration to take effect

chrome/browser/ui/webui/settings/system_handler.cc

 // Copyright 2016 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/ui/webui/settings/system_handler.h"
 
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/gpu/gpu_mode_manager.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/ui/webui/settings_utils.h"
 #include "content/public/browser/web_ui.h"
+#include "content/public/browser/web_ui_data_source.h"
 
-#if !defined(OS_CHROMEOS)
-#include "chrome/browser/ui/webui/settings_utils.h"
+#if defined(OS_WIN)
+#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
+#include "chrome/common/chrome_constants.h"
 #endif
 
 namespace settings {
 
 SystemHandler::SystemHandler() {}
 
 SystemHandler::~SystemHandler() {}
 
+// static
+void SystemHandler::AddLoadTimeData(content::WebUIDataSource* data_source) {
+  data_source->AddBoolean("hardwareAccelerationEnabledAtStartup",
+      g_browser_process->gpu_mode_manager()->initial_gpu_mode_pref());
+}
+
 void SystemHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("changeProxySettings",
       base::Bind(&SystemHandler::HandleChangeProxySettings,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("restartBrowser",
+      base::Bind(&SystemHandler::HandleRestartBrowser,
+                 base::Unretained(this)));
 }
 
 void SystemHandler::HandleChangeProxySettings(const base::ListValue* /*args*/) {
   base::RecordAction(base::UserMetricsAction("Options_ShowProxySettings"));
-#if defined(OS_CHROMEOS)
-  NOTREACHED();
-#else
   settings_utils::ShowNetworkProxySettings(web_ui()->GetWebContents());
+}
+
+void SystemHandler::HandleRestartBrowser(const base::ListValue* /*args*/) {
+#if defined(OS_WIN)
+  // On Windows Breakpad will upload crash reports if the breakpad pipe name
+  // environment variable is defined. So we undefine this environment variable
+  // before restarting, as the restarted processes will inherit their
+  // environment variables from ours, thus suppressing crash uploads.
+  if (!ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled()) {
+    HMODULE exe_module = GetModuleHandle(chrome::kBrowserProcessExecutableName);
+    if (exe_module) {
+      typedef void (__cdecl *ClearBreakpadPipeEnvVar)();
+      ClearBreakpadPipeEnvVar clear = reinterpret_cast<ClearBreakpadPipeEnvVar>(
+          GetProcAddress(exe_module, "ClearBreakpadPipeEnvironmentVariable"));
+      if (clear)
+        clear();
+    }
+  }
 #endif
+
+  chrome::AttemptRestart();
 }
 
 }  // namespace settings