try adding flag to allow lcd text even in a layer

src/core/SkDevice.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.
  */
 
 #include "SkColorFilter.h"
 #include "SkDevice.h"
 #include "SkDraw.h"
@@ skipping 37 matching lines @@
 const SkBitmap& SkBaseDevice::accessBitmap(bool changePixels) {
     const SkBitmap& bitmap = this->onAccessBitmap();
     if (changePixels) {
         bitmap.notifyPixelsChanged();
     }
     return bitmap;
 }
 
 SkPixelGeometry SkBaseDevice::CreateInfo::AdjustGeometry(const SkImageInfo& info,
                                                          TileUsage tileUsage,
-                                                         SkPixelGeometry geo) {
+                                                         SkPixelGeometry geo,
+                                                         bool preserveLCDText) {
     switch (tileUsage) {
         case kPossible_TileUsage:
             // (we think) for compatibility with old clients, we assume this layer can support LCD
             // even though they may not have marked it as opaque... seems like we should update
             // our callers (reed/robertphilips).
             break;
         case kNever_TileUsage:
-            if (info.alphaType() != kOpaque_SkAlphaType) {
+            if (!preserveLCDText) {
                 geo = kUnknown_SkPixelGeometry;
             }
             break;
     }
     return geo;
 }
 
 void SkBaseDevice::drawDRRect(const SkDraw& draw, const SkRRect& outer,
                               const SkRRect& inner, const SkPaint& paint) {
     SkPath path;
@@ skipping 362 matching lines @@
     if (kUnknown_SkPixelGeometry == fSurfaceProps.pixelGeometry()
         || this->onShouldDisableLCD(paint)) {
 
         flags &= ~SkPaint::kLCDRenderText_Flag;
         flags |= SkPaint::kGenA8FromLCD_Flag;
     }
 
     return flags;
 }