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

chromecast/browser/android/cast_content_window_android.cc

Index: chromecast/browser/android/cast_content_window_android.cc
diff --git a/chromecast/browser/android/cast_content_window_android.cc b/chromecast/browser/android/cast_content_window_android.cc
index 7c22d2c0f76c4f84a5b119244ca8b450e6faa7e7..ee932400b0dfa630533b530cdb3857eefbb7da8d 100644
--- a/chromecast/browser/android/cast_content_window_android.cc
+++ b/chromecast/browser/android/cast_content_window_android.cc
@@ -59,7 +59,8 @@ void CastContentWindowAndroid::SetTransparent() {
 }
 
 void CastContentWindowAndroid::ShowWebContents(
-    content::WebContents* web_contents) {
+    content::WebContents* web_contents,
+    CastWindowManager* window_manager) {
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jobject> java_web_contents =
       web_contents->GetJavaWebContents();