[LayoutNG] Add NGLineBoxFragment

third_party/WebKit/Source/core/layout/ng/ng_text_layout_algorithm_test.cc

 // Copyright 2017 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/ng/ng_base_layout_algorithm_test.h"
 
 #include "core/dom/TagCollection.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/layout/ng/ng_inline_node.h"
+#include "core/layout/ng/ng_physical_line_box_fragment.h"
 #include "core/layout/ng/ng_physical_text_fragment.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 namespace {
 
 class NGTextLayoutAlgorithmTest : public NGBaseLayoutAlgorithmTest {};
 
 // Verifies that text can flow correctly around floats that were positioned
@@ skipping 29 matching lines @@
   )HTML");
   // ** Run LayoutNG algorithm **
   RefPtr<NGConstraintSpace> space;
   RefPtr<NGPhysicalBoxFragment> html_fragment;
   std::tie(html_fragment, space) = RunBlockLayoutAlgorithmForElement(
       document().getElementsByTagName("html")->item(0));
   auto* body_fragment =
       toNGPhysicalBoxFragment(html_fragment->Children()[0].get());
   auto* container_fragment =
       toNGPhysicalBoxFragment(body_fragment->Children()[0].get());
-  auto* text_fragments_wrapper =
+  auto* line_box_fragments_wrapper =
       toNGPhysicalBoxFragment(container_fragment->Children()[0].get());
+  Vector<NGPhysicalTextFragment*> text_fragments;
+  for (const auto& child : line_box_fragments_wrapper->Children()) {
+    auto* line_box = toNGPhysicalLineBoxFragment(child.get());
+    EXPECT_EQ(1u, line_box->Children().size());
+    for (const auto& text : line_box->Children())
+      text_fragments.push_back(toNGPhysicalTextFragment(text.get()));
+  }
 
   LayoutText* layout_text =
       toLayoutText(getLayoutObjectByElementId("text")->slowFirstChild());
   ASSERT(layout_text->hasTextBoxes());
 
-  ASSERT_EQ(4UL, text_fragments_wrapper->Children().size());
+  ASSERT_EQ(4UL, text_fragments.size());
 
-  auto* text_fragment1 =
-      toNGPhysicalTextFragment(text_fragments_wrapper->Children()[0].get());
+  auto* text_fragment1 = text_fragments[0];
   // 40 = #left-float1' width 30 + #left-float2 10
   EXPECT_EQ(LayoutUnit(40), text_fragment1->LeftOffset());
   EXPECT_EQ("The quick ", text_fragment1->Text());
   InlineTextBox* inline_text_box1 = layout_text->firstTextBox();
   EXPECT_EQ(LayoutUnit(40), inline_text_box1->x());
 
-  auto* text_fragment2 =
-      toNGPhysicalTextFragment(text_fragments_wrapper->Children()[1].get());
+  auto* text_fragment2 = text_fragments[1];
   // 40 = #left-float1' width 30
   EXPECT_EQ(LayoutUnit(30), text_fragment2->LeftOffset());
   EXPECT_EQ("brown fox ", text_fragment2->Text());
   InlineTextBox* inline_text_box2 = inline_text_box1->nextTextBox();
   EXPECT_EQ(LayoutUnit(30), inline_text_box2->x());
 
-  auto* text_fragment3 =
-      toNGPhysicalTextFragment(text_fragments_wrapper->Children()[2].get());
+  auto* text_fragment3 = text_fragments[2];
   EXPECT_EQ(LayoutUnit(), text_fragment3->LeftOffset());
   EXPECT_EQ("jumps over the lazy ", text_fragment3->Text());
   InlineTextBox* inline_text_box3 = inline_text_box2->nextTextBox();
   EXPECT_EQ(LayoutUnit(), inline_text_box3->x());
 }
 
 // Verifies that text correctly flows around the inline float that fits on
 // the same text line.
 TEST_F(NGTextLayoutAlgorithmTest, TextFloatsAroundInlineFloatThatFitsOnLine) {
   setBodyInnerHTML(R"HTML(
@@ skipping 102 matching lines @@
   Element* narrow_float = document().getElementById("left-narrow");
   // 160 float-wide's width + 8 body's margin.
   EXPECT_EQ(160 + 8, narrow_float->offsetLeft());
 
   // On the same line.
   EXPECT_EQ(wide_float->offsetTop(), narrow_float->offsetTop());
 }
 
 }  // namespace
 }  // namespace blink