Add support for setting password value gated on user's gesture in a page

Source/core/page/Page.h

Index: Source/core/page/Page.h
diff --git a/Source/core/page/Page.h b/Source/core/page/Page.h
index f09626010b73984641fc17603d237795fb5fa493..783d3e9f4c6d11651f566089b727bd632d6615f7 100644
--- a/Source/core/page/Page.h
+++ b/Source/core/page/Page.h
@@ -224,6 +224,10 @@ public:
 
     void willBeDestroyed();
 
+    // Note: m_userGestureSeenSinceLastNavigation is set to false on every page navigation.
+    void setUserGestureSeen() { m_userGestureSeenSinceLastNavigation = true; }
+    bool userGestureSeenSinceLastNavigation() const { return m_userGestureSeenSinceLastNavigation; }
+
 protected:
     PageLifecycleNotifier& lifecycleNotifier();
 
@@ -290,6 +294,8 @@ private:
     bool m_isPainting;
 #endif
 
+    bool m_userGestureSeenSinceLastNavigation;
+
     HashSet<MultisamplingChangedObserver*> m_multisamplingChangedObservers;
 
     // A pointer to all the interfaces provided to in-process Frames for this Page.