Fix Pango font rendering with HiDPi displays on Linux.

ui/gfx/platform_font_linux.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/platform_font_linux.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/lazy_instance.h"
@@ skipping 73 matching lines @@
                                        &query.families, &query.style,
                                        &query.pixel_size))
           << "Failed to parse font description " << *default_font_description_;
       params = gfx::GetFontRenderParams(query, &family);
       size_pixels = query.pixel_size;
       style = query.style;
     }
 #else
     // On Linux, LinuxFontDelegate is used to query the native toolkit (e.g.
     // GTK+) for the default UI font.
-    const LinuxFontDelegate* delegate = LinuxFontDelegate::instance();
+    LinuxFontDelegate* delegate = LinuxFontDelegate::instance();

[Daniel Erat, 2015/03/19 17:11:44]

you should be able to preserve the 'const' here

[stapelberg, 2015/03/19 17:20:56]

Done.

     if (delegate) {
       delegate->GetDefaultFontDescription(
           &family, &size_pixels, &style, &params);
     }
 #endif
 
     g_default_font.Get() = new PlatformFontLinux(
         CreateSkTypeface(style, &family), family, size_pixels, style, params);
   }
 
@@ skipping 167 matching lines @@
   return new PlatformFontLinux;
 }
 
 // static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
   return new PlatformFontLinux(font_name, font_size);
 }
 
 }  // namespace gfx