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

third_party/WebKit/Source/core/layout/LayoutTestHelper.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/LayoutTestHelper.h"
 
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameHost.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "platform/scroll/ScrollbarTheme.h"
@@ skipping 13 matching lines @@
   m_child->init();
 
   return m_child.get();
 }
 
 void FrameLoaderClientWithParent::detached(FrameDetachType) {
   static_cast<SingleChildFrameLoaderClient*>(parent()->client())
       ->didDetachChild();
 }
 
+ChromeClient& RenderingTest::chromeClient() const {
+  DEFINE_STATIC_LOCAL(EmptyChromeClient, client, (EmptyChromeClient::create()));
+  return client;
+}
+
 RenderingTest::RenderingTest(FrameLoaderClient* frameLoaderClient)
     : m_frameLoaderClient(frameLoaderClient) {}
 
 void RenderingTest::SetUp() {
   Page::PageClients pageClients;
   fillWithEmptyClients(pageClients);
-  DEFINE_STATIC_LOCAL(EmptyChromeClient, chromeClient,
-                      (EmptyChromeClient::create()));
-  pageClients.chromeClient = &chromeClient;
+  pageClients.chromeClient = &chromeClient();
   m_pageHolder = DummyPageHolder::create(
       IntSize(800, 600), &pageClients, m_frameLoaderClient, settingOverrider());
 
   Settings::setMockScrollbarsEnabled(true);
   RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(true);
   EXPECT_TRUE(ScrollbarTheme::theme().usesOverlayScrollbars());
 
   // This ensures that the minimal DOM tree gets attached
   // correctly for tests that don't call setBodyInnerHTML.
   document().view()->updateAllLifecyclePhases();
 }
 
 void RenderingTest::TearDown() {
   // We need to destroy most of the Blink structure here because derived tests
   // may restore RuntimeEnabledFeatures setting during teardown, which happens
   // before our destructor getting invoked, breaking the assumption that REF
   // can't change during Blink lifetime.
   m_pageHolder = nullptr;
 
   // Clear memory cache, otherwise we can leak pruned resources.
   memoryCache()->evictResources();
 }
 
 void RenderingTest::setChildFrameHTML(const String& html) {
   childDocument().setBaseURLOverride(KURL(ParsedURLString, "http://test.com"));
   childDocument().body()->setInnerHTML(html, ASSERT_NO_EXCEPTION);
 }
 
 }  // namespace blink