PlzNavigate: properly execute BeforeUnload on renderer initiated navigations

third_party/WebKit/public/platform/WebURLRequest.h

Index: third_party/WebKit/public/platform/WebURLRequest.h
diff --git a/third_party/WebKit/public/platform/WebURLRequest.h b/third_party/WebKit/public/platform/WebURLRequest.h
index 09b58183fd9e0717ee776f2f549b0cd958e33800..0f1f38a6ab05205db485907910852b04ad686414 100644
--- a/third_party/WebKit/public/platform/WebURLRequest.h
+++ b/third_party/WebKit/public/platform/WebURLRequest.h
@@ -297,6 +297,12 @@ public:
     BLINK_PLATFORM_EXPORT bool checkForBrowserSideNavigation() const;
     BLINK_PLATFORM_EXPORT void setCheckForBrowserSideNavigation(bool);
 
+    // PlzNavigate: whether the loader should bypass executing the BeforeUnload
+    // event when loading this request. This is set to true when committing
+    // urls that have already made a network request, as the BeforeUnload event
+    // has already run before the network request was made.
+    BLINK_PLATFORM_EXPORT void setBypassBeforeUnload(bool);
+
     // This is used to report navigation metrics starting from the UI action
     // that triggered the navigation (which can be different from the navigation
     // start time used in the Navigation Timing API).