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

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

 // Copyright 2015 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/frame/FrameView.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLElement.h"
 #include "core/layout/LayoutObject.h"
@@ skipping 101 matching lines @@
 // If we don't hide the tooltip on scroll, it can negatively impact scrolling
 // performance. See crbug.com/586852 for details.
 TEST_P(FrameViewTest, HideTooltipWhenScrollPositionChanges) {
   document().body()->setInnerHTML(
       "<div style='width:1000px;height:1000px'></div>");
   document().view()->updateAllLifecyclePhases();
 
   EXPECT_CALL(chromeClient(), mockSetToolTip(document().frame(), String(), _));
   document().view()->layoutViewportScrollableArea()->setScrollOffset(
       ScrollOffset(1, 1), UserScroll);
+
+  // Programmatic scrolling should not dismiss the tooltip, so setToolTip
+  // should not be called for this invocation.
+  EXPECT_CALL(chromeClient(), mockSetToolTip(document().frame(), String(), _))
+      .Times(0);
+  document().view()->layoutViewportScrollableArea()->setScrollOffset(
+      ScrollOffset(2, 2), ProgrammaticScroll);
 }
 
 // NoOverflowInIncrementVisuallyNonEmptyPixelCount tests fail if the number of
 // pixels is calculated in 32-bit integer, because 65536 * 65536 would become 0
 // if it was calculated in 32-bit and thus it would be considered as empty.
 TEST_P(FrameViewTest, NoOverflowInIncrementVisuallyNonEmptyPixelCount) {
   EXPECT_FALSE(document().view()->isVisuallyNonEmpty());
   document().view()->incrementVisuallyNonEmptyPixelCount(IntSize(65536, 65536));
   EXPECT_TRUE(document().view()->isVisuallyNonEmpty());
 }
 
 }  // namespace
 }  // namespace blink