Allow background tab titles to use LCD AA.

ui/compositor/compositing_recorder.h

Index: ui/compositor/compositing_recorder.h
diff --git a/ui/compositor/compositing_recorder.h b/ui/compositor/compositing_recorder.h
index e50f6927575975815cf087eec6abefce8d805f7d..3a49ab36aea5b461e4b60ff19da41eaa50b0f034 100644
--- a/ui/compositor/compositing_recorder.h
+++ b/ui/compositor/compositing_recorder.h
@@ -26,10 +26,15 @@ class COMPOSITOR_EXPORT CompositingRecorder {
  public:
   // |alpha| is a value between 0 and 255, where 0 is transparent and 255 is
   // opaque. |size_in_context| is the size in the |context|'s space surrounding
-  // everything that's visible.
+  // everything that's visible.  |lcd_text_requires_opaque_layer| should
+  // normally be true; if this is false, Skia will respect text rendering
+  // requests for LCD AA even if they occur on non-opaque layers.  This should
+  // only be used in cases where the text is known to be rendered opaquely on an
+  // opaque background before compositing.
   CompositingRecorder(const PaintContext& context,
                       const gfx::Size& size_in_context,
-                      uint8_t alpha);
+                      uint8_t alpha,
+                      bool lcd_text_requires_opaque_layer);
   ~CompositingRecorder();
 
  private: