Defer loads on WebView popup windows until webcontents delegate attached

android_webview/native/aw_web_contents_delegate.cc

Index: android_webview/native/aw_web_contents_delegate.cc
diff --git a/android_webview/native/aw_web_contents_delegate.cc b/android_webview/native/aw_web_contents_delegate.cc
index 55170f07c832a099d9e28dc9181b132393988549..d8f85cff6da1f1f49317d0355ee7376b1b4af5f7 100644
--- a/android_webview/native/aw_web_contents_delegate.cc
+++ b/android_webview/native/aw_web_contents_delegate.cc
@@ -218,6 +218,13 @@ void AwWebContentsDelegate::LoadingStateChanged(WebContents* source,
   }
 }
 
+bool AwWebContentsDelegate::ShouldResumeRequestsForCreatedWindow() {
+  // Always return false here since we need to defer loading the created window
+  // until after we have attached a new delegate to the new webcontents (which
+  // happens asynchronously).
+  return false;
+}
+
 void AwWebContentsDelegate::RequestMediaAccessPermission(
     WebContents* web_contents,
     const content::MediaStreamRequest& request,