Remove GraphicsLayer::didScroll and directly call ScrollableArea::didScroll

third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp b/third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp
index 4909395535fb453198ee5dccb0ab8cf38b4ef2da..3a7b40b78c6a069ba2f8b421177a98886859a035 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollableAreaTest.cpp
@@ -253,4 +253,18 @@ TEST_F(ScrollableAreaTest, RecalculatesScrollbarOverlayIfBackgroundChanges) {
             scrollableArea->getScrollbarOverlayColorTheme());
 }
 
+TEST_F(ScrollableAreaTest, ScrollableAreaDidScroll) {
+  ScopedTestingPlatformSupport<TestingPlatformSupportWithMockScheduler>
+      platform;
+
+  MockScrollableArea* scrollableArea =
+      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