[Presentation API] (1st) (1-UA) Add is_offscreen_presentation attribute to MediaRouter

content/public/browser/presentation_session.h

Index: content/public/browser/presentation_session.h
diff --git a/content/public/browser/presentation_session.h b/content/public/browser/presentation_session.h
index 8e5eb54676d349921ea4872aa2c93fd359a0a9dd..11eaccff05f41beb3de57c508ab16b9f8711b3d4 100644
--- a/content/public/browser/presentation_session.h
+++ b/content/public/browser/presentation_session.h
@@ -32,11 +32,13 @@ enum PresentationConnectionCloseReason {
 // browser actions or Presentation API.
 struct CONTENT_EXPORT PresentationSessionInfo {
   PresentationSessionInfo(const GURL& presentation_url,
-                          const std::string& presentation_id);
+                          const std::string& presentation_id,
+                          bool is_offscreen);
   ~PresentationSessionInfo();
 
   const GURL presentation_url;
   const std::string presentation_id;
+  const bool is_offscreen;
 };
 
 // Possible reasons why an attempt to create a presentation session failed.