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

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

 // 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.
 
 #ifndef LayoutTestHelper_h
 #define LayoutTestHelper_h
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 55 matching lines @@
   Member<LocalFrame> m_parent;
 };
 
 class RenderingTest : public testing::Test {
   USING_FAST_MALLOC(RenderingTest);
 
  public:
   virtual FrameSettingOverrideFunction settingOverrider() const {
     return nullptr;
   }
+  virtual ChromeClient& chromeClient() const;
 
   RenderingTest(FrameLoaderClient* = nullptr);
 
  protected:
   void SetUp() override;
   void TearDown() override;
 
   Document& document() const { return m_pageHolder->document(); }
   LayoutView& layoutView() const {
     return *toLayoutView(
@@ skipping 26 matching lines @@
   }
 
  private:
   Persistent<FrameLoaderClient> m_frameLoaderClient;
   std::unique_ptr<DummyPageHolder> m_pageHolder;
 };
 
 }  // namespace blink
 
 #endif  // LayoutTestHelper_h