Move gfx::ElideText functionality to RenderText.

ui/gfx/render_text_pango.cc

 // Copyright (c) 2012 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_pango.h"
 
 #include <pango/pangocairo.h>
 #include <algorithm>
 #include <string>
 #include <vector>
@@ skipping 64 matching lines @@
 }
 
 RenderTextPango::~RenderTextPango() {
   ResetLayout();
 }
 
 Size RenderTextPango::GetStringSize() {
   EnsureLayout();
   int width = 0, height = 0;
   pango_layout_get_pixel_size(layout_, &width, &height);
+
+  // Pango returns 0 widths for very long strings (of 0x40000 chars or more).
+  // This is caused by an int overflow in pango_glyph_string_extents_range.
+  // Absurdly long strings may even report non-zero garbage values for width;
+  // while detecting that isn't worthwhile, this handles the 0 width cases.
+  const long kAbsurdLength = 100000;
+  if (width == 0 && g_utf8_strlen(layout_text_, -1) > kAbsurdLength)
+    width = font_list().GetExpectedTextWidth(g_utf8_strlen(layout_text_, -1));
+
   // Keep a consistent height between this particular string's PangoLayout and
   // potentially larger text supported by the FontList.
   // For example, if a text field contains a Japanese character, which is
   // smaller than Latin ones, and then later a Latin one is inserted, this
   // ensures that the text baseline does not shift.
   return Size(width, std::max(height, font_list().GetHeight()));
 }
 
 SelectionModel RenderTextPango::FindCursorPosition(const Point& point) {
   EnsureLayout();
@@ skipping 424 matching lines @@
                                           int glyph_index) const {
   return LayoutIndexToTextIndex(run->item->offset +
                                 run->glyphs->log_clusters[glyph_index]);
 }
 
 RenderText* RenderText::CreateNativeInstance() {
   return new RenderTextPango;
 }
 
 }  // namespace gfx