Replace hide-scrollbars flag with a web setting.

third_party/WebKit/Source/web/tests/VisualViewportTest.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/frame/VisualViewport.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 1445 matching lines @@
     webViewImpl()->applyViewportDeltas(WebFloatSize(), WebFloatSize(), WebFloatSize(), 1, -1);
     FrameView& frameView = *webViewImpl()->mainFrameImpl()->frameView();
     frameView.setScrollPosition(IntPoint(0, 10000), ProgrammaticScroll);
     EXPECT_EQ(500, frameView.scrollPositionDouble().y());
 
     // Now send the resize, make sure the scroll offset doesn't change.
     webViewImpl()->resizeWithTopControls(WebSize(1000, 1500), 500, false);
     EXPECT_EQ(500, frameView.scrollPositionDouble().y());
 }
 
+static void configureHiddenScrollbarsSettings(WebSettings* settings)
+{
+    VisualViewportTest::configureAndroidSettings(settings);
+    settings->setHideScrollbars(true);
+}
+
+// Tests that scrollbar layers are not attached to the inner viewport container
+// layer when hideScrollbars WebSetting is true.
+TEST_F(VisualViewportTest, TestScrollbarsNotAttachedWhenHideScrollbarsSettingIsTrue)
+{
+    initializeWithAndroidSettings(configureHiddenScrollbarsSettings);
+    webViewImpl()->resize(IntSize(100, 150));
+    navigateTo("about:blank");
+
+    VisualViewport& visualViewport = frame()->page()->frameHost().visualViewport();
+    EXPECT_FALSE(visualViewport.layerForHorizontalScrollbar()->parent());
+    EXPECT_FALSE(visualViewport.layerForVerticalScrollbar()->parent());
+}
+
+// Tests that scrollbar layers are attached to the inner viewport container
+// layer when hideScrollbars WebSetting is false.
+TEST_F(VisualViewportTest, TestScrollbarsAttachedWhenHideScrollbarsSettingIsFalse)
+{
+    initializeWithAndroidSettings();
+    webViewImpl()->resize(IntSize(100, 150));
+    navigateTo("about:blank");
+
+    VisualViewport& visualViewport = frame()->page()->frameHost().visualViewport();
+    EXPECT_TRUE(visualViewport.layerForHorizontalScrollbar()->parent());
+    EXPECT_TRUE(visualViewport.layerForVerticalScrollbar()->parent());
+}
+
 // Tests that the layout viewport's scroll layer bounds are updated in a compositing
 // change update. crbug.com/423188.
 TEST_P(ParameterizedVisualViewportTest, TestChangingContentSizeAffectsScrollBounds)
 {
     initializeWithAndroidSettings();
     webViewImpl()->resize(IntSize(100, 150));
 
     registerMockedHttpURLLoad("content-width-1000.html");
     navigateTo(m_baseURL + "content-width-1000.html");
 
@@ skipping 442 matching lines @@
 
     EXPECT_POINT_EQ(
         DoublePoint(),
         frameView.layoutViewportScrollableArea()->scrollPositionDouble());
     EXPECT_EQ(600, scroller->scrollTop());
 
     RuntimeEnabledFeatures::setSetRootScrollerEnabled(wasRootScrollerEnabled);
 }
 
 } // namespace