PlzNavigate: inform the WebFrameClient that a form will be submitted

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 6b0a1d00bc0cf7e4c20a489f25496a939d4ab7c7..77d724dbd911fb4886c590150a18819df6d4d1b1 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1333,7 +1333,7 @@ bool FrameLoader::shouldClose(bool isReload)
 
 bool FrameLoader::shouldContinueForNavigationPolicy(const ResourceRequest& request, const SubstituteData& substituteData,
     DocumentLoader* loader, ContentSecurityPolicyDisposition shouldCheckMainWorldContentSecurityPolicy,
-    NavigationType type, NavigationPolicy policy, bool replacesCurrentHistoryItem, bool isClientRedirect)
+    NavigationType type, NavigationPolicy policy, bool replacesCurrentHistoryItem, bool isClientRedirect, HTMLFormElement* form)
 {
     // Don't ask if we are loading an empty URL.
     if (request.url().isEmpty() || substituteData.isValid())
@@ -1363,6 +1363,12 @@ bool FrameLoader::shouldContinueForNavigationPolicy(const ResourceRequest& reque
     if (policy == NavigationPolicyHandledByClient) {
         // Mark the frame as loading since the embedder is handling the navigation.
         m_progressTracker->progressStarted();
+
+        // If this is a form submit, dispatch that a form is being submitted
+        // since the embedder is handling the navigation.
+        if (form)
+            client()->dispatchWillSubmitForm(form);
+
         return false;
     }
     if (!LocalDOMWindow::allowPopUp(*m_frame) && !UserGestureIndicator::processingUserGesture())
@@ -1383,8 +1389,13 @@ void FrameLoader::startLoad(FrameLoadRequest& frameLoadRequest, FrameLoadType ty
     frameLoadRequest.resourceRequest().setRequestContext(determineRequestContextFromNavigationType(navigationType));
     frameLoadRequest.resourceRequest().setFrameType(m_frame->isMainFrame() ? WebURLRequest::FrameTypeTopLevel : WebURLRequest::FrameTypeNested);
     ResourceRequest& request = frameLoadRequest.resourceRequest();
-    if (!shouldContinueForNavigationPolicy(request, frameLoadRequest.substituteData(), nullptr, frameLoadRequest.shouldCheckMainWorldContentSecurityPolicy(), navigationType, navigationPolicy, type == FrameLoadTypeReplaceCurrentItem, frameLoadRequest.clientRedirect() == ClientRedirect))
+    if (!shouldContinueForNavigationPolicy(request, frameLoadRequest.substituteData(), nullptr,
+        frameLoadRequest.shouldCheckMainWorldContentSecurityPolicy(), navigationType,
+        navigationPolicy, type == FrameLoadTypeReplaceCurrentItem,
+        frameLoadRequest.clientRedirect() == ClientRedirect, frameLoadRequest.form())) {
         return;
+    }
+
     if (!shouldClose(navigationType == NavigationTypeReload))
         return;