Don't force lcd on non-opaque portion of layer.

gm/lcdtext.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 /* Tests text rendering with LCD and subpixel rendering turned on and off.
  */
@@ skipping 127 matching lines @@
     paint.setTextSize(20);
 
     canvas->drawText("Hamburgefons", 12, 30, 30, paint);
 
     const bool gPreserveLCDText[] = { false, true };
 
     canvas->translate(0, 20);
     for (auto preserve : gPreserveLCDText) {
         preserve ? canvas->saveLayerPreserveLCDTextRequests(nullptr, nullptr)
                  : canvas->saveLayer(nullptr, nullptr);
-        canvas->drawText("Hamburgefons", 12, 30, 60, paint);
+        if (preserve) {
+            SkPaint noLCD = paint;
+            noLCD.setLCDRenderText(false);
+            canvas->drawText("LCD not supported", 17, 30, 60, noLCD);
+        } else {
+            canvas->drawText("Hamburgefons", 12, 30, 60, paint);
+        }
 
         SkPaint p;
         p.setColor(0xFFCCCCCC);
         canvas->drawRect(SkRect::MakeLTRB(25, 70, 200, 100), p);
         canvas->drawText("Hamburgefons", 12, 30, 90, paint);
 
         canvas->restore();
         canvas->translate(0, 80);
     }
 }