Support FontRenderParams on Win; fix RenderTextHarfBuzz.

ui/gfx/render_text.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.h"
 
 #include <algorithm>
 #include <climits>
 
 #include "base/command_line.h"
@@ skipping 180 matching lines @@
     paint_.setXfermodeMode(SkXfermode::kDstIn_Mode);
     canvas_skia_->drawRect(bounds_, paint_);
     canvas_skia_->restore();
   }
 }
 
 void SkiaTextRenderer::SetDrawLooper(SkDrawLooper* draw_looper) {
   paint_.setLooper(draw_looper);
 }
 
-void SkiaTextRenderer::SetFontSmoothingSettings(bool antialiasing,
-                                                bool subpixel_rendering,
-                                                bool subpixel_positioning) {
-  paint_.setAntiAlias(antialiasing);
-  paint_.setLCDRenderText(subpixel_rendering);
-  paint_.setSubpixelText(subpixel_positioning);
+void SkiaTextRenderer::SetFontRenderParams(const FontRenderParams& params,
+                                           bool background_is_transparent) {
+  paint_.setAntiAlias(params.antialiasing);
+  paint_.setLCDRenderText(!background_is_transparent &&
+      params.subpixel_rendering != FontRenderParams::SUBPIXEL_RENDERING_NONE);
+  paint_.setSubpixelText(params.subpixel_positioning);
 }
 
 void SkiaTextRenderer::SetFontHinting(SkPaint::Hinting hinting) {
   paint_.setHinting(hinting);
 }
 
 void SkiaTextRenderer::SetTypeface(SkTypeface* typeface) {
   paint_.setTypeface(typeface);
 }
 
@@ skipping 1098 matching lines @@
   cursor_bounds_ += delta_offset;
 }
 
 void RenderText::DrawSelection(Canvas* canvas) {
   const std::vector<Rect> sel = GetSubstringBounds(selection());
   for (std::vector<Rect>::const_iterator i = sel.begin(); i < sel.end(); ++i)
     canvas->FillRect(*i, selection_background_focused_color_);
 }
 
 }  // namespace gfx