Device Service: Decouple Wake Lock from //content

content/public/browser/web_contents.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 170 matching lines @@
   CONTENT_EXPORT static WebContents* CreateWithSessionStorage(
       const CreateParams& params,
       const SessionStorageNamespaceMap& session_storage_namespace_map);
 
   // Returns the WebContents that owns the RenderViewHost, or nullptr if the
   // render view host's delegate isn't a WebContents.
   CONTENT_EXPORT static WebContents* FromRenderViewHost(RenderViewHost* rvh);
 
   CONTENT_EXPORT static WebContents* FromRenderFrameHost(RenderFrameHost* rfh);
 
+  // Returns the WebContents associated with |id|.
+  CONTENT_EXPORT static WebContents* FromId(int id);

[blundell, 2017/03/07 20:41:15]

If we stick with this approach, I'll modify this to avoid adding this into the
WebContents interface (where it presumably would not be at all desired) and
instead will make a WakeLockServiceContextHost class that is owned by
WebContents and does the mapping.

+
   // Returns the WebContents associated with the |frame_tree_node_id|.
   CONTENT_EXPORT static WebContents* FromFrameTreeNodeId(
       int frame_tree_node_id);
 
   // Sets delegate for platform specific screen orientation functionality.
   CONTENT_EXPORT static void SetScreenOrientationDelegate(
       ScreenOrientationDelegate* delegate);
 
   ~WebContents() override {}
 
   // Intrinsic tab state -------------------------------------------------------
 
+  // Gets the globally-unique ID associated with this WebContents.
+  virtual int GetId() = 0;
+
   // Gets/Sets the delegate.
   virtual WebContentsDelegate* GetDelegate() = 0;
   virtual void SetDelegate(WebContentsDelegate* delegate) = 0;
 
   // Gets the controller for this WebContents.
   virtual NavigationController& GetController() = 0;
   virtual const NavigationController& GetController() const = 0;
 
   // Returns the user browser context associated with this WebContents (via the
   // NavigationController).
@@ skipping 574 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_