Move ownership of PowerSaveBlocker from WakeLockServiceContext to WakeLockServiceImpl

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index f968ca22bcc00ec6ed8fbea79ba067f88e1963f7..fe97f7693afc86b1c562e1940fb697bd37b6dfd3 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -43,6 +43,12 @@ namespace blink {
 struct WebFindOptions;
 }
 
+namespace device {
+namespace mojom {
+class WakeLockContext;
+}
+}
+
 namespace net {
 struct LoadStateWithParam;
 }
@@ -654,6 +660,9 @@ class WebContents : public PageNavigator,
   // 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 */