Allow background tab titles to use LCD AA.

cc/playback/compositing_display_item.h

Index: cc/playback/compositing_display_item.h
diff --git a/cc/playback/compositing_display_item.h b/cc/playback/compositing_display_item.h
index 95121895f00c5e8718cfe16ca8456111e66c515d..4c08cd8020414e11766c464917ca33730d19fff0 100644
--- a/cc/playback/compositing_display_item.h
+++ b/cc/playback/compositing_display_item.h
@@ -23,7 +23,8 @@ class CC_EXPORT CompositingDisplayItem : public DisplayItem {
   CompositingDisplayItem(uint8_t alpha,
                          SkXfermode::Mode xfermode,
                          SkRect* bounds,
-                         skia::RefPtr<SkColorFilter> color_filter);
+                         skia::RefPtr<SkColorFilter> color_filter,
+                         bool allow_lcd_text);

[danakj, 2015/12/11 19:07:00]

can you rename this a bit? currently it sounds like false would disallow lcd
text, but this is more of an override to force allow, and false just does the
default behaviour. perhaps always_allow_lcd_text?

   explicit CompositingDisplayItem(const proto::DisplayItem& proto);
   ~CompositingDisplayItem() override;
 
@@ -42,13 +43,15 @@ class CC_EXPORT CompositingDisplayItem : public DisplayItem {
   void SetNew(uint8_t alpha,
               SkXfermode::Mode xfermode,
               SkRect* bounds,
-              skia::RefPtr<SkColorFilter> color_filter);
+              skia::RefPtr<SkColorFilter> color_filter,
+              bool allow_lcd_text);
 
   uint8_t alpha_;
   SkXfermode::Mode xfermode_;
   bool has_bounds_;
   SkRect bounds_;
   skia::RefPtr<SkColorFilter> color_filter_;
+  bool allow_lcd_text_;
 };
 
 class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {