Fix textPath textLength position adjustment for the spacing case

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 188 matching lines @@
           text_content_element->textLength()->CurrentValue()->Value(
               length_context);
     else
       desired_text_length = 0;
   }
 
   if (!desired_text_length)
     return;
 
   float total_length = text_path_chunk_layout_builder.TotalLength();
-  if (length_adjust == kSVGLengthAdjustSpacing)
-    text_path_spacing_ = (desired_text_length - total_length) /
-                         text_path_chunk_layout_builder.TotalCharacters();
-  else
+  if (length_adjust == kSVGLengthAdjustSpacing) {
+    text_path_spacing_ = 0;
+    if (text_path_chunk_layout_builder.TotalCharacters() > 1) {
+      text_path_spacing_ = desired_text_length - total_length;
+      text_path_spacing_ /=
+          text_path_chunk_layout_builder.TotalCharacters() - 1;
+    }
+  } else {
     text_path_scaling_ = desired_text_length / total_length;
+  }
 }
 
 void SVGTextLayoutEngine::EndTextPathLayout() {
   in_path_layout_ = false;
   text_path_ = nullptr;
   text_path_start_offset_ = 0;
   text_path_current_offset_ = 0;
   text_path_spacing_ = 0;
   text_path_scaling_ = 1;
 }
@@ skipping 318 matching lines @@
   }
 
   if (!did_start_text_fragment)
     return;
 
   // Close last open fragment, if needed.
   RecordTextFragment(text_box);
 }
 
 }  // namespace blink