[Line Layout API] Add needsLayout() to LineLayoutItem

This CL updates all callers in core/layout/line/ that call needsLayout()
on a LayoutObject.

BUG=499321

Review URL: https://codereview.chromium.org/1299273002

git-svn-id: svn://svn.chromium.org/blink/trunk@200838 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/layout/api/LineLayoutItem.h

@@ -40,6 +40,11 @@ public:
     // https://crbug.com/499321
     operator LayoutObject*() const { return m_layoutObject; }
 
+    bool needsLayout() const
+    {
+        return m_layoutObject->needsLayout();
+    }
+
     Node* node() const
     {
         return m_layoutObject->node();

third_party/WebKit/Source/core/layout/line/AbstractInlineTextBox.cpp

@@ -87,7 +87,7 @@ void AbstractInlineTextBox::detach()
 
 PassRefPtr<AbstractInlineTextBox> AbstractInlineTextBox::nextInlineTextBox() const
 {
-    ASSERT(!m_inlineTextBox || !m_inlineTextBox->layoutObject().needsLayout());
+    ASSERT(!m_inlineTextBox || !m_inlineTextBox->lineLayoutItem().needsLayout());
     if (!m_inlineTextBox)
         return nullptr;
 
@@ -172,19 +172,19 @@ String AbstractInlineTextBox::text() const
 
 bool AbstractInlineTextBox::isFirst() const
 {
-    ASSERT(!m_inlineTextBox || !m_inlineTextBox->layoutObject().needsLayout());
+    ASSERT(!m_inlineTextBox || !m_inlineTextBox->lineLayoutItem().needsLayout());
     return !m_inlineTextBox || !m_inlineTextBox->prevTextBox();
 }
 
 bool AbstractInlineTextBox::isLast() const
 {
-    ASSERT(!m_inlineTextBox || !m_inlineTextBox->layoutObject().needsLayout());
+    ASSERT(!m_inlineTextBox || !m_inlineTextBox->lineLayoutItem().needsLayout());
     return !m_inlineTextBox || !m_inlineTextBox->nextTextBox();
 }
 
 PassRefPtr<AbstractInlineTextBox> AbstractInlineTextBox::nextOnLine() const
 {
-    ASSERT(!m_inlineTextBox || !m_inlineTextBox->layoutObject().needsLayout());
+    ASSERT(!m_inlineTextBox || !m_inlineTextBox->lineLayoutItem().needsLayout());
     if (!m_inlineTextBox)
         return nullptr;
 
@@ -197,7 +197,7 @@ PassRefPtr<AbstractInlineTextBox> AbstractInlineTextBox::nextOnLine() const
 
 PassRefPtr<AbstractInlineTextBox> AbstractInlineTextBox::previousOnLine() const
 {
-    ASSERT(!m_inlineTextBox || !m_inlineTextBox->layoutObject().needsLayout());
+    ASSERT(!m_inlineTextBox || !m_inlineTextBox->lineLayoutItem().needsLayout());
     if (!m_inlineTextBox)
         return nullptr;