[MediaRouter] Adds GetPresentationServiceDelegate impl to ChromeContentBrowserClient

chrome/browser/media/router/presentation_service_delegate_impl.cc

Index: chrome/browser/media/router/presentation_service_delegate_impl.cc
diff --git a/chrome/browser/media/router/presentation_service_delegate_impl.cc b/chrome/browser/media/router/presentation_service_delegate_impl.cc
index ebe434d4e8e8d01fd6607d8d7a32a5e352b74e62..5b7c04240e45f46d32690924ec65e2f3d3b4c004 100644
--- a/chrome/browser/media/router/presentation_service_delegate_impl.cc
+++ b/chrome/browser/media/router/presentation_service_delegate_impl.cc
@@ -327,6 +327,20 @@ void PresentationFrameManager::SetMediaRouterForTest(MediaRouter* router) {
   router_ = router;
 }
 
+PresentationServiceDelegateImpl*
+PresentationServiceDelegateImpl::GetOrCreateForWebContents(
+    content::WebContents* web_contents) {
+  DCHECK(web_contents);
+  PresentationServiceDelegateImpl* delegateImpl =

[imcheng (use chromium acct), 2015/06/04 18:48:36]

s/delegateImpl/delegate_impl

[haibinlu, 2015/06/04 20:25:45]

Done.

+      PresentationServiceDelegateImpl::FromWebContents(web_contents);

[imcheng (use chromium acct), 2015/06/04 18:48:36]

You can just do the following:

// No-ops if it already exists.
PresentationServiceDelegateImpl::CreateForWebContents(web_contents);
return PresentationServiceDelegateImpl::FromWebContents(web_contents);

[haibinlu, 2015/06/04 20:25:45]

Done.

+  if (!delegateImpl) {
+    PresentationServiceDelegateImpl::CreateForWebContents(web_contents);
+    delegateImpl = PresentationServiceDelegateImpl::FromWebContents(
+        web_contents);
+  }
+  return delegateImpl;
+}
+
 PresentationServiceDelegateImpl::PresentationServiceDelegateImpl(
     content::WebContents* web_contents)
     : web_contents_(web_contents),