Only clear tooltip message on a user scroll or compositor scroll.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 7befa59cab9596c4259b88f2b9181b14a778f3c7..7bd6f7d99b8069848ed49ca77198f2a2947e59b0 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -3816,9 +3816,10 @@ void FrameView::updateScrollOffset(const ScrollOffset& offset,
   document->enqueueScrollEventForNode(document);
 
   m_frame->eventHandler().dispatchFakeMouseMoveEventSoon();
-  Page* page = frame().page();
-  if (page)
-    page->chromeClient().clearToolTip(*m_frame);
+  if (scrollType == UserScroll || scrollType == CompositorScroll) {
+    if (Page* page = frame().page())

[tdresser, 2017/01/03 13:56:32]

Moving the assignment to within the conditional makes this harder to read IMO.

+      page->chromeClient().clearToolTip(*m_frame);
+  }
 
   LayoutViewItem layoutViewItem = document->layoutViewItem();
   if (!layoutViewItem.isNull()) {