1 files changed, 90 insertions, 0 deletions
diff --git a/dom/power/WakeLock.h b/dom/power/WakeLock.h
new file mode 100644
index 0000000000..fc8919946b
--- /dev/null
+++ b/dom/power/WakeLock.h
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_power_WakeLock_h
+#define mozilla_dom_power_WakeLock_h
+
+#include "nsCOMPtr.h"
+#include "nsIDOMEventListener.h"
+#include "nsIObserver.h"
+#include "nsString.h"
+#include "nsWeakReference.h"
+#include "nsWrapperCache.h"
+#include "mozilla/ErrorResult.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+namespace dom {
+
+class ContentParent;
+
+class WakeLock final
+  : public nsIDOMEventListener
+  , public nsWrapperCache
+  , public nsIObserver
+  , public nsSupportsWeakReference
+{
+public:
+  NS_DECL_NSIDOMEVENTLISTENER
+  NS_DECL_NSIOBSERVER
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(WakeLock, nsIDOMEventListener)
+
+  // Note: WakeLock lives for the lifetime of the document in order to avoid
+  // exposing GC behavior to pages. This means that
+  // |var foo = navigator.requestWakeLock('cpu'); foo = null;|
+  // doesn't unlock the 'cpu' resource.
+
+  WakeLock();
+
+  // Initialize this wake lock on behalf of the given window.  Null windows are
+  // allowed; a lock without an associated window is always considered
+  // invisible.
+  nsresult Init(const nsAString &aTopic, nsPIDOMWindowInner* aWindow);
+
+  // Initialize this wake lock on behalf of the given process.  If the process
+  // dies, the lock is released.  A wake lock initialized via this method is
+  // always considered visible.
+  nsresult Init(const nsAString &aTopic, ContentParent* aContentParent);
+
+  // WebIDL methods
+
+  nsPIDOMWindowInner* GetParentObject() const;
+
+  virtual JSObject*
+  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetTopic(nsAString& aTopic);
+
+  void Unlock(ErrorResult& aRv);
+
+private:
+  virtual ~WakeLock();
+
+  void     DoUnlock();
+  void     DoLock();
+  void     AttachEventListener();
+  void     DetachEventListener();
+
+  bool      mLocked;
+  bool      mHidden;
+
+  // The ID of the ContentParent on behalf of whom we acquired this lock, or
+  // CONTENT_PROCESS_UNKNOWN_ID if this lock was acquired on behalf of the
+  // current process.
+  uint64_t  mContentParentID;
+  nsString  mTopic;
+
+  // window that this was created for.  Weak reference.
+  nsWeakPtr mWindow;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_power_WakeLock_h