[Chromecast] Reuse the Aura window manager across receiver apps.

chromecast/browser/cast_content_window.h

Index: chromecast/browser/cast_content_window.h
diff --git a/chromecast/browser/cast_content_window.h b/chromecast/browser/cast_content_window.h
index 929f2a7e29d7466df2387e0d103b5b5bf7fd9f91..b53b56503d73432f25ecd778de91d1f35a4e81e0 100644
--- a/chromecast/browser/cast_content_window.h
+++ b/chromecast/browser/cast_content_window.h
@@ -16,6 +16,8 @@ class WebContents;
 }
 
 namespace chromecast {
+class CastWindowManager;
+
 namespace shell {
 
 // Class that represents the "window" a WebContents is displayed in cast_shell.
@@ -45,7 +47,9 @@ class CastContentWindow {
 
   // Creates a full-screen window for |web_contents| and display it.
   // |web_contents| should outlive this CastContentWindow.
-  virtual void ShowWebContents(content::WebContents* web_contents) = 0;
+  // |window_manager| should outlive this CastContentWindow.
+  virtual void ShowWebContents(content::WebContents* web_contents,
+                               CastWindowManager* window_manager) = 0;
 
   // Creates a WebContents.
   // TODO(derekjchow): remove this function from this class, since it doesn't