Cache gfx::RenderText instances in views::Label.

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index 89acc9401ab7f9b736fd34e7af0c6558c7defc82..db03b84fe9f54261f0690c8cc6636e2abd8263e4 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -205,8 +205,8 @@ void SkiaTextRenderer::SetDrawLooper(SkDrawLooper* draw_looper) {
 }
 
 void SkiaTextRenderer::SetFontRenderParams(const FontRenderParams& params,
-                                           bool background_is_transparent) {
-  ApplyRenderParams(params, background_is_transparent, &paint_);
+                                           bool subpixel_rendering_enabled) {
+  ApplyRenderParams(params, subpixel_rendering_enabled, &paint_);
 }
 
 void SkiaTextRenderer::SetTypeface(SkTypeface* typeface) {
@@ -388,10 +388,10 @@ skia::RefPtr<SkTypeface> CreateSkiaTypeface(const std::string& family,
 }
 
 void ApplyRenderParams(const FontRenderParams& params,
-                       bool background_is_transparent,
+                       bool subpixel_rendering_enabled,
                        SkPaint* paint) {
   paint->setAntiAlias(params.antialiasing);
-  paint->setLCDRenderText(!background_is_transparent &&
+  paint->setLCDRenderText(subpixel_rendering_enabled &&
       params.subpixel_rendering != FontRenderParams::SUBPIXEL_RENDERING_NONE);
   paint->setSubpixelText(params.subpixel_positioning);
   paint->setAutohinted(params.autohinter);
@@ -403,6 +403,7 @@ void ApplyRenderParams(const FontRenderParams& params,
 RenderText::~RenderText() {
 }
 
+// static
 RenderText* RenderText::CreateInstance() {
 #if defined(OS_MACOSX)
   static const bool use_native =
@@ -414,6 +415,7 @@ RenderText* RenderText::CreateInstance() {
   return new RenderTextHarfBuzz;
 }
 
+// static
 RenderText* RenderText::CreateInstanceForEditing() {
   return new RenderTextHarfBuzz;
 }
@@ -920,7 +922,7 @@ RenderText::RenderText()
       text_elided_(false),
       min_line_height_(0),
       multiline_(false),
-      background_is_transparent_(false),
+      subpixel_rendering_enabled_(true),
       clip_to_display_rect_(true),
       baseline_(kInvalidBaseline),
       cached_bounds_and_offset_valid_(false) {