Don't explicitly initialize LayoutUnit to 0.

third_party/WebKit/Source/core/layout/VisualRectMappingTest.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/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/PaintInvalidationState.h"
 #include "core/paint/PaintLayer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 213 matching lines @@
 
 TEST_F(VisualRectMappingTest, ContainerOverflowScroll)
 {
     setBodyInnerHTML(
         "<div id='container' style='position: absolute; top: 111px; left: 222px;"
         "    border: 10px solid red; overflow: scroll; width: 50px; height: 80px;'>"
         "    <div id='target' style='box-shadow: 40px 20px black; width: 100px; height: 90px'></div>"
         "</div>");
 
     LayoutBlock* container = toLayoutBlock(getLayoutObjectByElementId("container"));
-    EXPECT_EQ(LayoutUnit(0), container->scrollTop());
-    EXPECT_EQ(LayoutUnit(0), container->scrollLeft());
+    EXPECT_EQ(LayoutUnit(), container->scrollTop());
+    EXPECT_EQ(LayoutUnit(), container->scrollLeft());
     container->setScrollTop(LayoutUnit(7));
     container->setScrollLeft(LayoutUnit(8));
     document().view()->updateAllLifecyclePhases();
 
     LayoutBlock* target = toLayoutBlock(getLayoutObjectByElementId("target"));
     LayoutRect targetOverflowRect = target->localOverflowRectForPaintInvalidation();
     // 140 = width(100) + box_shadow_offset_x(40)
     // 110 = height(90) + box_shadow_offset_y(20)
     EXPECT_EQ(LayoutRect(0, 0, 140, 110), targetOverflowRect);
     LayoutRect rect = targetOverflowRect;
@@ skipping 34 matching lines @@
 {
     setBodyInnerHTML(
         "<div id='container' style='writing-mode: vertical-rl; position: absolute; top: 111px; left: 222px;"
         "    border: solid red; border-width: 10px 20px 30px 40px;"
         "    overflow: scroll; width: 50px; height: 80px'>"
         "    <div id='target' style='box-shadow: 40px 20px black; width: 100px; height: 90px'></div>"
         "    <div style='width: 100px; height: 100px'></div>"
         "</div>");
 
     LayoutBlock* container = toLayoutBlock(getLayoutObjectByElementId("container"));
-    EXPECT_EQ(LayoutUnit(0), container->scrollTop());
+    EXPECT_EQ(LayoutUnit(), container->scrollTop());
     // The initial scroll offset is to the left-most because of flipped blocks writing mode.
     // 150 = total_layout_overflow(100 + 100) - width(50)
     EXPECT_EQ(LayoutUnit(150), container->scrollLeft());
     container->setScrollTop(LayoutUnit(7));
     container->setScrollLeft(LayoutUnit(142)); // Scroll to the right by 8 pixels.
     document().view()->updateAllLifecyclePhases();
 
     LayoutBlock* target = toLayoutBlock(getLayoutObjectByElementId("target"));
     LayoutRect targetOverflowRect = target->localOverflowRectForPaintInvalidation();
     // -40 = -box_shadow_offset_x(40) (with target's top-right corner as the origin)
@@ skipping 42 matching lines @@
 
 TEST_F(VisualRectMappingTest, ContainerOverflowHidden)
 {
     setBodyInnerHTML(
         "<div id='container' style='position: absolute; top: 111px; left: 222px;"
         "    border: 10px solid red; overflow: hidden; width: 50px; height: 80px;'>"
         "    <div id='target' style='box-shadow: 40px 20px black; width: 100px; height: 90px'></div>"
         "</div>");
 
     LayoutBlock* container = toLayoutBlock(getLayoutObjectByElementId("container"));
-    EXPECT_EQ(LayoutUnit(0), container->scrollTop());
-    EXPECT_EQ(LayoutUnit(0), container->scrollLeft());
+    EXPECT_EQ(LayoutUnit(), container->scrollTop());
+    EXPECT_EQ(LayoutUnit(), container->scrollLeft());
     container->setScrollTop(LayoutUnit(27));
     container->setScrollLeft(LayoutUnit(28));
     document().view()->updateAllLifecyclePhases();
 
     LayoutBlock* target = toLayoutBlock(getLayoutObjectByElementId("target"));
     LayoutRect targetOverflowRect = target->localOverflowRectForPaintInvalidation();
     // 140 = width(100) + box_shadow_offset_x(40)
     // 110 = height(90) + box_shadow_offset_y(20)
     EXPECT_EQ(LayoutRect(0, 0, 140, 110), targetOverflowRect);
     LayoutRect rect = targetOverflowRect;
@@ skipping 10 matching lines @@
 {
     setBodyInnerHTML(
         "<div id='container' style='writing-mode: vertical-rl; position: absolute; top: 111px; left: 222px;"
         "    border: solid red; border-width: 10px 20px 30px 40px;"
         "    overflow: hidden; width: 50px; height: 80px'>"
         "    <div id='target' style='box-shadow: 40px 20px black; width: 100px; height: 90px'></div>"
         "    <div style='width: 100px; height: 100px'></div>"
         "</div>");
 
     LayoutBlock* container = toLayoutBlock(getLayoutObjectByElementId("container"));
-    EXPECT_EQ(LayoutUnit(0), container->scrollTop());
+    EXPECT_EQ(LayoutUnit(), container->scrollTop());
     // The initial scroll offset is to the left-most because of flipped blocks writing mode.
     // 150 = total_layout_overflow(100 + 100) - width(50)
     EXPECT_EQ(LayoutUnit(150), container->scrollLeft());
     container->setScrollTop(LayoutUnit(7));
     container->setScrollLeft(LayoutUnit(82)); // Scroll to the right by 8 pixels.
     document().view()->updateAllLifecyclePhases();
 
     LayoutBlock* target = toLayoutBlock(getLayoutObjectByElementId("target"));
     LayoutRect targetOverflowRect = target->localOverflowRectForPaintInvalidation();
     // -40 = -box_shadow_offset_x(40) (with target's top-right corner as the origin)
@@ skipping 17 matching lines @@
 {
     setBodyInnerHTML(
         "<div id='container' style='writing-mode: vertical-rl; position: absolute; top: 111px; left: 222px;"
         "    border: solid red; border-width: 10px 20px 30px 40px;"
         "    overflow: scroll; width: 50px; height: 80px'>"
         "    <div id='target' style='writing-mode: vertical-lr; box-shadow: 40px 20px black; width: 100px; height: 90px'></div>"
         "    <div style='width: 100px; height: 100px'></div>"
         "</div>");
 
     LayoutBlock* container = toLayoutBlock(getLayoutObjectByElementId("container"));
-    EXPECT_EQ(LayoutUnit(0), container->scrollTop());
+    EXPECT_EQ(LayoutUnit(), container->scrollTop());
     // The initial scroll offset is to the left-most because of flipped blocks writing mode.
     // 150 = total_layout_overflow(100 + 100) - width(50)
     EXPECT_EQ(LayoutUnit(150), container->scrollLeft());
     container->setScrollTop(LayoutUnit(7));
     container->setScrollLeft(LayoutUnit(142)); // Scroll to the right by 8 pixels.
     document().view()->updateAllLifecyclePhases();
 
     LayoutBlock* target = toLayoutBlock(getLayoutObjectByElementId("target"));
     LayoutRect targetOverflowRect = target->localOverflowRectForPaintInvalidation();
     // 140 = width(100) + box_shadow_offset_x(40)
@@ skipping 79 matching lines @@
     LayoutRect absoluteOverflowRect = absolute->localOverflowRectForPaintInvalidation();
     EXPECT_EQ(LayoutRect(0, 0, 50, 50), absoluteOverflowRect);
     LayoutRect rect = absoluteOverflowRect;
     EXPECT_TRUE(absolute->mapToVisualRectInAncestorSpace(stackingContext, rect));
     // -172 = top(50) - y_offset_of_stacking_context(222)
     EXPECT_EQ(LayoutRect(50, -172, 50, 50), rect);
     checkPaintInvalidationStateRectMapping(rect, absoluteOverflowRect, *absolute, layoutView(), *stackingContext);
 }
 
 } // namespace blink