Ignore print() during page dismissal.

third_party/WebKit/Source/core/page/ChromeClient.cpp

Index: third_party/WebKit/Source/core/page/ChromeClient.cpp
diff --git a/third_party/WebKit/Source/core/page/ChromeClient.cpp b/third_party/WebKit/Source/core/page/ChromeClient.cpp
index a7c4ea868efbf805f6c00a50f6c8e5cf9fadac22..d6c420805cb2fcef263c7bd16bdd633fb4411c73 100644
--- a/third_party/WebKit/Source/core/page/ChromeClient.cpp
+++ b/third_party/WebKit/Source/core/page/ChromeClient.cpp
@@ -29,6 +29,7 @@
 #include "core/inspector/ConsoleMessage.h"
 #include "core/layout/HitTestResult.h"
 #include "core/page/FrameTree.h"
+#include "core/page/Page.h"
 #include "core/page/ScopedPageSuspender.h"
 #include "core/page/WindowFeatures.h"
 #include "core/probe/CoreProbes.h"
@@ -222,6 +223,11 @@ void ChromeClient::ClearToolTip(LocalFrame& frame) {
 }
 
 bool ChromeClient::Print(LocalFrame* frame) {
+  if (!CanOpenModalIfDuringPageDismissal(*frame->GetPage()->MainFrame(),
+                                         ChromeClient::kPrintDialog, "")) {
+    return false;
+  }
+
   if (frame->GetDocument()->IsSandboxed(kSandboxModals)) {
     UseCounter::Count(frame, UseCounter::kDialogInSandboxedContext);
     frame->Console().AddMessage(ConsoleMessage::Create(