Ensure minimum baseline and height values

ui/gfx/render_text_harfbuzz.cc

 // Copyright 2014 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 "ui/gfx/render_text_harfbuzz.h"
 
 #include <map>
 
 #include "base/i18n/bidi_line_iterator.h"
 #include "base/i18n/break_iterator.h"
@@ skipping 439 matching lines @@
 }  // namespace internal
 
 RenderTextHarfBuzz::RenderTextHarfBuzz()
     : RenderText(),
       needs_layout_(false) {}
 
 RenderTextHarfBuzz::~RenderTextHarfBuzz() {}
 
 Size RenderTextHarfBuzz::GetStringSize() {
   EnsureLayout();
-  return Size(lines()[0].size.width(), font_list().GetHeight());
+  return lines()[0].size;
 }
 
 SelectionModel RenderTextHarfBuzz::FindCursorPosition(const Point& point) {
   EnsureLayout();
 
   int x = ToTextPoint(point).x();
   int offset = 0;
   size_t run_index = GetRunContainingXCoord(x, &offset);
   if (run_index >= runs_.size())
     return EdgeSelectionModel((x < 0) ? CURSOR_LEFT : CURSOR_RIGHT);
@@ skipping 224 matching lines @@
     }
 
     needs_layout_ = false;
     std::vector<internal::Line> empty_lines;
     set_lines(&empty_lines);
   }
 
   if (lines().empty()) {
     std::vector<internal::Line> lines;
     lines.push_back(internal::Line());
+    lines[0].baseline = font_list().GetBaseline();
+    lines[0].size.set_height(font_list().GetHeight());
 
     int current_x = 0;
     SkPaint paint;
 
     for (size_t i = 0; i < runs_.size(); ++i) {
       const internal::TextRunHarfBuzz& run = *runs_[visual_to_logical_[i]];
       internal::LineSegment segment;
       segment.x_range = Range(current_x, current_x + run.width);
       segment.char_range = run.range;
       segment.run = i;
@@ skipping 257 matching lines @@
     run->positions[i].set(run->width + x_offset, y_offset);
     run->width +=
         SkScalarRoundToInt(SkFixedToScalar(hb_positions[i].x_advance));
   }
 
   hb_buffer_destroy(buffer);
   hb_font_destroy(harfbuzz_font);
 }
 
 }  // namespace gfx