Fix mouse cursor update timer to be page-global instead of per-frame

Source/core/page/Chrome.cpp

Index: Source/core/page/Chrome.cpp
diff --git a/Source/core/page/Chrome.cpp b/Source/core/page/Chrome.cpp
index ebc849ccffbf6e86d7f872fe840d543fd0a65694..a6f9cb7bae589cec26f3fc30fdbbacef8d153205 100644
--- a/Source/core/page/Chrome.cpp
+++ b/Source/core/page/Chrome.cpp
@@ -336,9 +336,15 @@ void Chrome::dispatchViewportPropertiesDidChange(const ViewportDescription& desc
 
 void Chrome::setCursor(const Cursor& cursor)
 {
+    m_lastSetMouseCursorForTesting = cursor;
     m_client->setCursor(cursor);
 }
 
+Cursor Chrome::getLastSetCursorForTesting() const
+{
+    return m_lastSetMouseCursorForTesting;
+}
+
 void Chrome::scheduleAnimation()
 {
     m_page->animator().setAnimationFramePending();