Move ownership of PowerSaveBlocker from WakeLockServiceContext to WakeLockServiceImpl

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 25 matching lines @@
 #endif
 
 namespace base {
 class TimeTicks;
 }
 
 namespace blink {
 struct WebFindOptions;
 }
 
+namespace device {
+namespace mojom {
+class WakeLockContext;
+}
+}
+
 namespace net {
 struct LoadStateWithParam;
 }
 
 namespace service_manager {
 class InterfaceProvider;
 }
 
 namespace content {
 
@@ skipping 591 matching lines @@
   // Returns true if this WebContents was opened by another WebContents, even
   // if the opener was suppressed. In contrast to HasOpener/GetOpener, the
   // original opener doesn't reflect window.opener which can be suppressed or
   // updated.
   virtual bool HasOriginalOpener() const = 0;
 
   // Returns the original opener if HasOriginalOpener() is true, or nullptr
   // otherwise.
   virtual WebContents* GetOriginalOpener() const = 0;
 
+  // Returns the WakeLockContext accociated with this WebContents.
+  virtual device::mojom::WakeLockContext* GetWakeLockContext() = 0;

[blundell, 2017/05/02 11:27:43]

nit: Nothing in this CL is using this method, right? It seems like we could
introduce it in the next CL (i.e., the one that uses it).

[ke.he, 2017/05/04 11:54:13]

It is used by WebContentsImpl::GetRendererWakeLock(), when init the
|renderer_wake_lock_|. I feel it is also good to add the declaration in
webcontent.h, Although it is ok to declare it only in web_content_impl.h for
now.

+
   typedef base::Callback<void(
       int, /* id */
       int, /* HTTP status code */
       const GURL&, /* image_url */
       const std::vector<SkBitmap>&, /* bitmaps */
       /* The sizes in pixel of the bitmaps before they were resized due to the
          max bitmap size passed to DownloadImage(). Each entry in the bitmaps
          vector corresponds to an entry in the sizes vector. If a bitmap was
          resized, there should be a single returned bitmap. */
       const std::vector<gfx::Size>&)>
@@ skipping 120 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_