Wake Lock API implementation (Chromium part)

content/browser/wake_lock/wake_lock_service_context.h

+// Copyright 2015 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.
+
+#ifndef CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_SERVICE_CONTEXT_H_
+#define CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_SERVICE_CONTEXT_H_
+
+#include <set>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/browser/wake_lock/wake_lock_service_impl.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace content {
+
+class PowerSaveBlocker;
+class RenderFrameHost;
+class WebContents;
+
+class CONTENT_EXPORT WakeLockServiceContext
+    : public WebContentsObserver {
+ public:
+  explicit WakeLockServiceContext(WebContents* web_contents);
+  ~WakeLockServiceContext() override;
+
+  // Creates a WakeLockServiceImpl that is strongly bound to |request|.
+  void CreateService(const RenderFrameHost* render_frame_host,
+                     mojo::InterfaceRequest<WakeLockService> request);
+
+  // WebContentsObserver implementation.
+  void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
+  void RenderFrameHostChanged(RenderFrameHost* old_host,
+                              RenderFrameHost* new_host) override;
+
+  // Requests wake lock for |render_frame_host|.
+  void RequestWakeLock(const RenderFrameHost* render_frame_host);
+
+  // Cancels wake lock request for |render_frame_host|.
+  void CancelWakeLock(const RenderFrameHost* render_frame_host);
+
+  // Used by tests.
+  bool HasWakeLockForTests() const;
+
+ private:
+  void CreateWakeLock();
+  void RemoveWakeLock();
+  void UpdateWakeLock();
+
+  // Set of all frames currently requesting wake lock.
+  std::set<const RenderFrameHost*> frames_requesting_lock_;
+
+  // The actual power save blocker for screen.
+  scoped_ptr<PowerSaveBlocker> wake_lock_;
+
+  base::WeakPtrFactory<WakeLockServiceContext> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WakeLockServiceContext);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_SERVICE_CONTEXT_H_