Apply hinting in SkiaTextRenderer::SetFontRenderParams().

ui/gfx/font_render_params_linux.cc

Index: ui/gfx/font_render_params_linux.cc
diff --git a/ui/gfx/font_render_params_linux.cc b/ui/gfx/font_render_params_linux.cc
index 9d75f38af92deea24cc3736a1ac9c151c4db7989..4a06c59f13a957098855de933fc620776c6e4f7c 100644
--- a/ui/gfx/font_render_params_linux.cc
+++ b/ui/gfx/font_render_params_linux.cc
@@ -63,6 +63,9 @@ void LoadDefaults(FontRenderParams* params, bool renderer) {
   }
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+  // TODO(derat): Get the autohinter setting from FontConfig. Until then,
+  // maintain backward compatibility with what we were doing previously.
+  params->autohinter = renderer;

[Daniel Erat, 2014/07/10 23:46:35]

so this is pretty gross. SkiaTextRenderer wasn't passing the setting through to
SkPaint previously, but android_webview/native/aw_settings.cc and
chrome/browser/renderer_preferences_util.cc _do_ appear to have been passing it
to the renderer. on linux, it'd default to true since that's what we set it to
for chrome os above.

my larger followup change that attaches a FontRenderParams struct to each
gfx::PlatformFont makes us get the autohinter setting from FontConfig, at which
case i'm hopeful this code can go. (although we'll then get the opportunity to
discover how many users have the autohinter turned on in FontConfig
accidentally.)

[msw, 2014/07/11 00:29:09]

Acknowledged.

   const LinuxFontDelegate* delegate = LinuxFontDelegate::instance();
   if (delegate) {
     params->antialiasing = delegate->UseAntialiasing();