Merge "UseCounter: Count form submission in orphan tree." to M52

third_party/WebKit/Source/core/html/HTMLFormElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLFormElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
index db015fc469f5a3074b5ec72296455beb1effd92f..8c7155f0084461c49da277afeb7362a52f13eb45 100644
--- a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
@@ -340,6 +340,9 @@ void HTMLFormElement::submit(Event* event, bool activateSubmitButton)
     LocalFrame* frame = document().frame();
     if (!view || !frame || !frame->page())
         return;
+    // See crbug.com/586749.
+    if (!inShadowIncludingDocument())
+        UseCounter::count(document(), UseCounter::FormSubmissionNotInDocumentTree);
 
     if (m_isSubmittingOrInUserJSSubmitEvent) {
         m_shouldSubmit = true;