Add a user pref in Settings to disable all GPU features.

chrome/browser/gpu/gpu_mode_manager.cc

+// Copyright (c) 2013 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/gpu/gpu_mode_manager.h"
+
+#include "base/bind.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/gpu_data_manager.h"
+
+// static
+void GpuModeManager::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterBooleanPref(
+      prefs::kHardwareAccelerationModeEnabled, true);
+}
+
+GpuModeManager::GpuModeManager() {
+  if (g_browser_process->local_state()) {  // Skip for unit tests
+    pref_registrar_.Init(g_browser_process->local_state());
+    // Do nothing when the pref changes. It takes effect after
+    // chrome restarts.
+    pref_registrar_.Add(
+        prefs::kHardwareAccelerationModeEnabled,
+        base::Bind(&base::DoNothing));
+
+    if (!IsGpuModePrefEnabled()) {
+      content::GpuDataManager* gpu_data_manager =
+          content::GpuDataManager::GetInstance();
+      DCHECK(gpu_data_manager);
+      gpu_data_manager->DisableHardwareAcceleration();
+    }
+  }
+}
+
+GpuModeManager::~GpuModeManager() {
+}
+
+bool GpuModeManager::IsGpuModePrefEnabled() const {
+  PrefService* service = g_browser_process->local_state();
+  DCHECK(service);
+  return service->GetBoolean(
+      prefs::kHardwareAccelerationModeEnabled);
+}
+