Device Service: Decouple Wake Lock from //content

content/browser/wake_lock/wake_lock_context_host.h

+// Copyright 2017 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_CONTEXT_HOST_H_
+#define CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_CONTEXT_HOST_H_
+
+#include "content/public/browser/web_contents.h"
+#include "device/wake_lock/public/interfaces/wake_lock_context.mojom.h"
+#include "device/wake_lock/public/interfaces/wake_lock_context_provider.mojom.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace content {
+
+// On Android, WakeLockContext requires the NativeView associated with the
+// context in order to lock the screen. WakeLockContextHost provides this
+// functionality by mapping WakeLockContext IDs to the WebContents associated
+// with those IDs.
+class WakeLockContextHost {
+ public:
+  WakeLockContextHost(WebContents* web_contents);

[dcheng, 2017/03/17 06:55:26]

Nit: explicit

[blundell, 2017/03/17 12:28:21]

Done.

+  ~WakeLockContextHost();
+
+  // This callback is passed into the DeviceService constructor in order to
+  // enable WakeLockContext to map a context ID to a Native View as necessary.
+  static gfx::NativeView GetNativeViewForContext(int context_id);
+
+  // Returns the WakeLockContext* to which this instance is connected.
+  device::mojom::WakeLockContext* GetWakeLockContext() {
+    return wake_lock_context_.get();
+  }
+
+ private:
+  // This instance's ID.
+  int id_;
+
+  // The WebContents that owns this instance.
+  WebContents* web_contents_;
+
+  // The WakeLockContext instance that is connected to this instance.
+  device::mojom::WakeLockContextPtr wake_lock_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(WakeLockContextHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_CONTEXT_HOST_H_