Allow background tab titles to use LCD AA.

cc/playback/compositing_display_item.cc

Index: cc/playback/compositing_display_item.cc
diff --git a/cc/playback/compositing_display_item.cc b/cc/playback/compositing_display_item.cc
index b9cd395e62fae475ff7e017ef7a37bbf2f1886a1..34c06502f4e298bef211190dde3b2c3c9afe6fe0 100644
--- a/cc/playback/compositing_display_item.cc
+++ b/cc/playback/compositing_display_item.cc
@@ -22,8 +22,9 @@ namespace cc {
 CompositingDisplayItem::CompositingDisplayItem(uint8_t alpha,
                                                SkXfermode::Mode xfermode,
                                                SkRect* bounds,
-                                               skia::RefPtr<SkColorFilter> cf) {
-  SetNew(alpha, xfermode, bounds, std::move(cf));
+                                               skia::RefPtr<SkColorFilter> cf,
+                                               bool allow_lcd_text) {
+  SetNew(alpha, xfermode, bounds, std::move(cf), allow_lcd_text);
 }
 
 CompositingDisplayItem::CompositingDisplayItem(
@@ -47,7 +48,7 @@ CompositingDisplayItem::CompositingDisplayItem(
     filter = skia::AdoptRef(static_cast<SkColorFilter*>(flattenable));
   }
 
-  SetNew(alpha, xfermode, bounds.get(), std::move(filter));
+  SetNew(alpha, xfermode, bounds.get(), std::move(filter), false);

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

Can you add this flag to the proto?

 }
 
 CompositingDisplayItem::~CompositingDisplayItem() {
@@ -56,13 +57,15 @@ CompositingDisplayItem::~CompositingDisplayItem() {
 void CompositingDisplayItem::SetNew(uint8_t alpha,
                                     SkXfermode::Mode xfermode,
                                     SkRect* bounds,
-                                    skia::RefPtr<SkColorFilter> cf) {
+                                    skia::RefPtr<SkColorFilter> cf,
+                                    bool allow_lcd_text) {
   alpha_ = alpha;
   xfermode_ = xfermode;
   has_bounds_ = !!bounds;
   if (bounds)
     bounds_ = SkRect(*bounds);
   color_filter_ = std::move(cf);
+  allow_lcd_text_ = allow_lcd_text;
 }
 
 void CompositingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
@@ -90,7 +93,11 @@ void CompositingDisplayItem::Raster(
   paint.setXfermodeMode(xfermode_);
   paint.setAlpha(alpha_);
   paint.setColorFilter(color_filter_.get());
-  canvas->saveLayer(has_bounds_ ? &bounds_ : nullptr, &paint);
+  const SkRect* bounds = has_bounds_ ? &bounds_ : nullptr;
+  if (allow_lcd_text_)
+    canvas->saveLayerPreserveLCDTextRequests(bounds, &paint);
+  else
+    canvas->saveLayer(bounds, &paint);
 }
 
 void CompositingDisplayItem::AsValueInto(