PlzNavigate: send searchable form data to the browser side on form submission.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index a9d545394537eb5b152752ebedbb5874fbbbc824..d003943052900afe7d9b1b7bd28f77dbc5c86d4f 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -36,6 +36,7 @@
 #include "WebDOMMessageEvent.h"
 #include "WebDataSource.h"
 #include "WebFileChooserParams.h"
+#include "WebFormElement.h"
 #include "WebFrame.h"
 #include "WebFrameOwnerProperties.h"
 #include "WebHistoryCommitType.h"
@@ -81,7 +82,6 @@ class WebEncryptedMediaClient;
 class WebExternalPopupMenu;
 class WebExternalPopupMenuClient;
 class WebFileChooserCompletion;
-class WebFormElement;
 class WebInstalledAppClient;
 class WebLocalFrame;
 class WebMediaPlayer;
@@ -289,6 +289,7 @@ class BLINK_EXPORT WebFrameClient {
     bool replacesCurrentHistoryItem;
     bool isHistoryNavigationInNewChildFrame;
     bool isClientRedirect;
+    WebFormElement form;
 
     NavigationPolicyInfo(WebURLRequest& urlRequest)
         : extraData(nullptr),