MacViews: Enable word lookup for selectable views::Labels and multi-line text.

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index 78bc651aee32c479ec8f84d793b7d520ee2cba33..a0dbb0baa4511a52fce724d225a46c1f1324d4b7 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -1031,12 +1031,10 @@ Vector2d RenderText::GetLineOffset(size_t line_number) {
 bool RenderText::GetDecoratedWordAtPoint(const Point& point,
                                          DecoratedText* decorated_word,
                                          Point* baseline_point) {
-  // FindCursorPosition doesn't currently support multiline. See
-  // http://crbug.com/650120.
-  if (multiline() || obscured())
+  if (obscured())
     return false;
 
-  // Note: FindCursorPosition will trigger a layout via EnsureLayout.
+  EnsureLayout();
   const SelectionModel model_at_point = FindCursorPosition(point);
   const size_t word_index =
       GetNearestWordStartBoundary(model_at_point.caret_pos());
@@ -1057,7 +1055,12 @@ bool RenderText::GetDecoratedWordAtPoint(const Point& point,
   const auto left_rect = std::min_element(
       word_bounds.begin(), word_bounds.end(),
       [](const Rect& lhs, const Rect& rhs) { return lhs.x() < rhs.x(); });
-  *baseline_point = left_rect->origin() + Vector2d(0, GetDisplayTextBaseline());
+  const int line_index = GetLineContainingYCoord(left_rect->CenterPoint().y() -
+                                                 GetLineOffset(0).y());
+  if (line_index < 0 || line_index >= static_cast<int>(lines().size()))
+    return false;
+  *baseline_point =
+      left_rect->origin() + Vector2d(0, lines()[line_index].baseline);
   return true;
 }
 
@@ -1387,6 +1390,21 @@ void RenderText::UpdateStyleLengths() {
     styles_[style].SetMax(text_length);
 }
 
+int RenderText::GetLineContainingYCoord(float text_y) {
+  if (text_y < 0)
+    return -1;
+
+  for (size_t i = 0; i < lines().size(); i++) {
+    const internal::Line& line = lines()[i];
+
+    if (text_y <= line.size.height())
+      return i;
+    text_y -= line.size.height();
+  }
+
+  return lines().size();
+}
+
 // static
 bool RenderText::RangeContainsCaret(const Range& range,
                                     size_t caret_pos,