diff --git a/boot_control_chromeos.cc b/boot_control_chromeos.cc
new file mode 100644
index 0000000..fd248ab
--- /dev/null
+++ b/boot_control_chromeos.cc
@@ -0,0 +1,304 @@
+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "update_engine/boot_control_chromeos.h"
+
+#include <string>
+
+#include <base/bind.h>
+#include <base/files/file_path.h>
+#include <base/files/file_util.h>
+#include <base/strings/string_util.h>
+#include <brillo/make_unique_ptr.h>
+#include <rootdev/rootdev.h>
+
+extern "C" {
+#include <vboot/vboot_host.h>
+}
+
+#include "update_engine/common/boot_control.h"
+#include "update_engine/common/subprocess.h"
+#include "update_engine/common/utils.h"
+
+using std::string;
+
+namespace {
+
+const char* kChromeOSPartitionNameKernel = "kernel";
+const char* kChromeOSPartitionNameRoot = "root";
+const char* kAndroidPartitionNameKernel = "boot";
+const char* kAndroidPartitionNameRoot = "system";
+
+// Returns the currently booted rootfs partition. "/dev/sda3", for example.
+string GetBootDevice() {
+  char boot_path[PATH_MAX];
+  // Resolve the boot device path fully, including dereferencing through
+  // dm-verity.
+  int ret = rootdev(boot_path, sizeof(boot_path), true, false);
+  if (ret < 0) {
+    LOG(ERROR) << "rootdev failed to find the root device";
+    return "";
+  }
+  LOG_IF(WARNING, ret > 0) << "rootdev found a device name with no device node";
+
+  // This local variable is used to construct the return string and is not
+  // passed around after use.
+  return boot_path;
+}
+
+// ExecCallback called when the execution of setgoodkernel finishes. Notifies
+// the caller of MarkBootSuccessfullAsync() by calling |callback| with the
+// result.
+void OnMarkBootSuccessfulDone(base::Callback<void(bool)> callback,
+                              int return_code,
+                              const string& output) {
+  callback.Run(return_code == 0);
+}
+
+}  // namespace
+
+namespace chromeos_update_engine {
+
+namespace boot_control {
+
+// Factory defined in boot_control.h.
+std::unique_ptr<BootControlInterface> CreateBootControl() {
+  std::unique_ptr<BootControlChromeOS> boot_control_chromeos(
+      new BootControlChromeOS());
+  if (!boot_control_chromeos->Init()) {
+    LOG(ERROR) << "Ignoring BootControlChromeOS failure. We won't run updates.";
+  }
+  return brillo::make_unique_ptr(boot_control_chromeos.release());
+}
+
+}  // namespace boot_control
+
+bool BootControlChromeOS::Init() {
+  string boot_device = GetBootDevice();
+  if (boot_device.empty())
+    return false;
+
+  int partition_num;
+  if (!utils::SplitPartitionName(boot_device, &boot_disk_name_, &partition_num))
+    return false;
+
+  // All installed Chrome OS devices have two slots. We don't update removable
+  // devices, so we will pretend we have only one slot in that case.
+  if (IsRemovableDevice(boot_disk_name_)) {
+    LOG(INFO)
+        << "Booted from a removable device, pretending we have only one slot.";
+    num_slots_ = 1;
+  } else {
+    // TODO(deymo): Look at the actual number of slots reported in the GPT.
+    num_slots_ = 2;
+  }
+
+  // Search through the slots to see which slot has the partition_num we booted
+  // from. This should map to one of the existing slots, otherwise something is
+  // very wrong.
+  current_slot_ = 0;
+  while (current_slot_ < num_slots_ &&
+         partition_num !=
+             GetPartitionNumber(kChromeOSPartitionNameRoot, current_slot_)) {
+    current_slot_++;
+  }
+  if (current_slot_ >= num_slots_) {
+    LOG(ERROR) << "Couldn't find the slot number corresponding to the "
+                  "partition " << boot_device
+               << ", number of slots: " << num_slots_
+               << ". This device is not updateable.";
+    num_slots_ = 1;
+    current_slot_ = BootControlInterface::kInvalidSlot;
+    return false;
+  }
+
+  LOG(INFO) << "Booted from slot " << current_slot_ << " (slot "
+            << SlotName(current_slot_) << ") of " << num_slots_
+            << " slots present on disk " << boot_disk_name_;
+  return true;
+}
+
+unsigned int BootControlChromeOS::GetNumSlots() const {
+  return num_slots_;
+}
+
+BootControlInterface::Slot BootControlChromeOS::GetCurrentSlot() const {
+  return current_slot_;
+}
+
+bool BootControlChromeOS::GetPartitionDevice(const string& partition_name,
+                                             unsigned int slot,
+                                             string* device) const {
+  int partition_num = GetPartitionNumber(partition_name, slot);
+  if (partition_num < 0)
+    return false;
+
+  string part_device = utils::MakePartitionName(boot_disk_name_, partition_num);
+  if (part_device.empty())
+    return false;
+
+  *device = part_device;
+  return true;
+}
+
+bool BootControlChromeOS::IsSlotBootable(Slot slot) const {
+  int partition_num = GetPartitionNumber(kChromeOSPartitionNameKernel, slot);
+  if (partition_num < 0)
+    return false;
+
+  CgptAddParams params;
+  memset(&params, '\0', sizeof(params));
+  params.drive_name = const_cast<char*>(boot_disk_name_.c_str());
+  params.partition = partition_num;
+
+  int retval = CgptGetPartitionDetails(&params);
+  if (retval != CGPT_OK)
+    return false;
+
+  return params.successful || params.tries > 0;
+}
+
+bool BootControlChromeOS::MarkSlotUnbootable(Slot slot) {
+  LOG(INFO) << "Marking slot " << SlotName(slot) << " unbootable";
+
+  if (slot == current_slot_) {
+    LOG(ERROR) << "Refusing to mark current slot as unbootable.";
+    return false;
+  }
+
+  int partition_num = GetPartitionNumber(kChromeOSPartitionNameKernel, slot);
+  if (partition_num < 0)
+    return false;
+
+  CgptAddParams params;
+  memset(&params, 0, sizeof(params));
+
+  params.drive_name = const_cast<char*>(boot_disk_name_.c_str());
+  params.partition = partition_num;
+
+  params.successful = false;
+  params.set_successful = true;
+
+  params.tries = 0;
+  params.set_tries = true;
+
+  int retval = CgptSetAttributes(&params);
+  if (retval != CGPT_OK) {
+    LOG(ERROR) << "Marking kernel unbootable failed.";
+    return false;
+  }
+
+  return true;
+}
+
+bool BootControlChromeOS::SetActiveBootSlot(Slot slot) {
+  LOG(INFO) << "Marking slot " << SlotName(slot) << " active.";
+
+  int partition_num = GetPartitionNumber(kChromeOSPartitionNameKernel, slot);
+  if (partition_num < 0)
+    return false;
+
+  CgptPrioritizeParams prio_params;
+  memset(&prio_params, 0, sizeof(prio_params));
+
+  prio_params.drive_name = const_cast<char*>(boot_disk_name_.c_str());
+  prio_params.set_partition = partition_num;
+
+  prio_params.max_priority = 0;
+
+  int retval = CgptPrioritize(&prio_params);
+  if (retval != CGPT_OK) {
+    LOG(ERROR) << "Unable to set highest priority for slot " << SlotName(slot)
+               << " (partition " << partition_num << ").";
+    return false;
+  }
+
+  CgptAddParams add_params;
+  memset(&add_params, 0, sizeof(add_params));
+
+  add_params.drive_name = const_cast<char*>(boot_disk_name_.c_str());
+  add_params.partition = partition_num;
+
+  add_params.tries = 6;
+  add_params.set_tries = true;
+
+  retval = CgptSetAttributes(&add_params);
+  if (retval != CGPT_OK) {
+    LOG(ERROR) << "Unable to set NumTriesLeft to " << add_params.tries
+               << " for slot " << SlotName(slot) << " (partition "
+               << partition_num << ").";
+    return false;
+  }
+
+  return true;
+}
+
+bool BootControlChromeOS::MarkBootSuccessfulAsync(
+    base::Callback<void(bool)> callback) {
+  return Subprocess::Get().Exec(
+             {"/usr/sbin/chromeos-setgoodkernel"},
+             base::Bind(&OnMarkBootSuccessfulDone, callback)) != 0;
+}
+
+// static
+string BootControlChromeOS::SysfsBlockDevice(const string& device) {
+  base::FilePath device_path(device);
+  if (device_path.DirName().value() != "/dev") {
+    return "";
+  }
+  return base::FilePath("/sys/block").Append(device_path.BaseName()).value();
+}
+
+// static
+bool BootControlChromeOS::IsRemovableDevice(const string& device) {
+  string sysfs_block = SysfsBlockDevice(device);
+  string removable;
+  if (sysfs_block.empty() ||
+      !base::ReadFileToString(base::FilePath(sysfs_block).Append("removable"),
+                              &removable)) {
+    return false;
+  }
+  base::TrimWhitespaceASCII(removable, base::TRIM_ALL, &removable);
+  return removable == "1";
+}
+
+int BootControlChromeOS::GetPartitionNumber(
+    const string partition_name,
+    BootControlInterface::Slot slot) const {
+  if (slot >= num_slots_) {
+    LOG(ERROR) << "Invalid slot number: " << slot << ", we only have "
+               << num_slots_ << " slot(s)";
+    return -1;
+  }
+
+  // In Chrome OS, the partition numbers are hard-coded:
+  //   KERNEL-A=2, ROOT-A=3, KERNEL-B=4, ROOT-B=4, ...
+  // To help compatibility between different we accept both lowercase and
+  // uppercase names in the ChromeOS or Brillo standard names.
+  // See http://www.chromium.org/chromium-os/chromiumos-design-docs/disk-format
+  string partition_lower = base::StringToLowerASCII(partition_name);
+  int base_part_num = 2 + 2 * slot;
+  if (partition_lower == kChromeOSPartitionNameKernel ||
+      partition_lower == kAndroidPartitionNameKernel)
+    return base_part_num + 0;
+  if (partition_lower == kChromeOSPartitionNameRoot ||
+      partition_lower == kAndroidPartitionNameRoot)
+    return base_part_num + 1;
+  LOG(ERROR) << "Unknown Chrome OS partition name \"" << partition_name << "\"";
+  return -1;
+}
+
+}  // namespace chromeos_update_engine