Reland of Wake Lock API implementation (Chromium part)

content/browser/wake_lock/wake_lock_service_context.h

Index: content/browser/wake_lock/wake_lock_service_context.h
diff --git a/content/browser/wake_lock/wake_lock_service_context.h b/content/browser/wake_lock/wake_lock_service_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..f3114d73e9467b3d1c7b9ac47b5d9b2d5f6b32db
--- /dev/null
+++ b/content/browser/wake_lock/wake_lock_service_context.h
@@ -0,0 +1,68 @@
+// 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 <utility>
+
+#include "base/macros.h"
+#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(int render_process_id,
+                     int render_frame_id,
+                     mojo::InterfaceRequest<WakeLockService> request);
+
+  // WebContentsObserver implementation.
+  void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
+
+  // Requests wake lock for RenderFrame identified by |render_process_id| and
+  // |render_frame_id|.
+  void RequestWakeLock(int render_process_id, int render_frame_id);
+
+  // Cancels wake lock request for RenderFrame identified by
+  // |render_process_id| and |render_frame_id|.
+  void CancelWakeLock(int render_process_id, int render_frame_id);
+
+  // Used by tests.
+  bool HasWakeLockForTests() const;
+
+ private:
+  void CreateWakeLock();
+  void RemoveWakeLock();
+  void UpdateWakeLock();
+
+  // Set of (render_process_id, render_frame_id) pairs identifying all
+  // RenderFrames requesting wake lock.
+  std::set<std::pair<int, int>> 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_