Overlay scrollbars flush with window edge

third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.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 "platform/scroll/ScrollableArea.h"
 
 #include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/scroll/ScrollbarTestSuite.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/scroll/ScrollbarThemeMock.h"
 #include "platform/testing/FakeGraphicsLayer.h"
 #include "platform/testing/FakeGraphicsLayerClient.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "public/platform/Platform.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 namespace {
 
 using testing::_;
 using testing::Return;
 
 class ScrollbarThemeWithMockInvalidation : public ScrollbarThemeMock {
  public:
   MOCK_CONST_METHOD0(shouldRepaintAllPartsOnInvalidation, bool());
-  MOCK_CONST_METHOD3(invalidateOnThumbPositionChange,
-                     ScrollbarPart(const ScrollbarThemeClient&, float, float));
+  MOCK_CONST_METHOD3(
+      invalidateOnThumbPositionChange,
+      ScrollbarPart(const ScrollbarThemeClient&, float, float, bool));
 };
 
 }  // namespace
 
 using ScrollableAreaTest = testing::Test;
 
 TEST_F(ScrollableAreaTest, ScrollAnimatorCurrentPositionShouldBeSync) {
   ScopedTestingPlatformSupport<TestingPlatformSupportWithMockScheduler>
       platform;
 
@@ skipping 220 matching lines @@
       MockScrollableArea::create(ScrollOffset(100, 100));
   scrollableArea->setScrollOrigin(IntPoint(20, 30));
   scrollableArea->didScroll(gfx::ScrollOffset(40, 51));
 
   // After calling didScroll, the new offset should account for scroll origin.
   EXPECT_EQ(20, scrollableArea->scrollOffsetInt().width());
   EXPECT_EQ(21, scrollableArea->scrollOffsetInt().height());
 }
 
 }  // namespace blink