[Line Layout API] Add textStartOffset to LineLayoutText

This CL updates callers in LayoutText.cpp.

BUG=499321

Review URL: https://codereview.chromium.org/1330433003

git-svn-id: svn://svn.chromium.org/blink/trunk@201988 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/layout/LayoutText.cpp

@@ -35,6 +35,7 @@
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutTextCombine.h"
 #include "core/layout/LayoutView.h"
+#include "core/layout/api/LineLayoutBox.h"
 #include "core/layout/line/AbstractInlineTextBox.h"
 #include "core/layout/line/EllipsisBox.h"
 #include "core/layout/line/GlyphOverflow.h"
@@ -523,7 +524,7 @@ static PositionWithAffinity createPositionWithAffinityForBox(const InlineBox* bo
         affinity = offset > box->caretMinOffset() ? VP_UPSTREAM_IF_POSSIBLE : TextAffinity::Downstream;
         break;
     }
-    int textStartOffset = box->layoutObject().isText() ? toLayoutText(box->layoutObject()).textStartOffset() : 0;
+    int textStartOffset = box->lineLayoutItem().isText() ? LineLayoutText(box->lineLayoutItem()).textStartOffset() : 0;
     return box->layoutObject().createPositionWithAffinity(offset + textStartOffset, affinity);
 }
 
@@ -541,7 +542,7 @@ static PositionWithAffinity createPositionWithAffinityForBoxAfterAdjustingOffset
 
         const InlineBox* prevBox = box->prevLeafChildIgnoringLineBreak();
         if ((prevBox && prevBox->bidiLevel() == box->bidiLevel())
-            || box->layoutObject().containingBlock()->style()->direction() == box->direction()) // FIXME: left on 12CBA
+            || box->lineLayoutItem().containingBlock().style()->direction() == box->direction()) // FIXME: left on 12CBA
             return createPositionWithAffinityForBox(box, box->caretLeftmostOffset(), shouldAffinityBeDownstream);
 
         if (prevBox && prevBox->bidiLevel() > box->bidiLevel()) {
@@ -571,7 +572,7 @@ static PositionWithAffinity createPositionWithAffinityForBoxAfterAdjustingOffset
 
     const InlineBox* nextBox = box->nextLeafChildIgnoringLineBreak();
     if ((nextBox && nextBox->bidiLevel() == box->bidiLevel())
-        || box->layoutObject().containingBlock()->style()->direction() == box->direction())
+        || box->lineLayoutItem().containingBlock().style()->direction() == box->direction())
         return createPositionWithAffinityForBox(box, box->caretRightmostOffset(), shouldAffinityBeDownstream);
 
     // offset is on the right edge

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

@@ -122,6 +122,11 @@ public:
         return toText()->selectionStartEnd(spos, epos);
     }
 
+    unsigned textStartOffset() const
+    {
+        return toText()->textStartOffset();
+    }
+
 private:
     LayoutText* toText() { return toLayoutText(layoutObject()); }
     const LayoutText* toText() const { return toLayoutText(layoutObject()); }