when we disable lcd for impl reasons, add kGenA8 to document the original intent

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkCanvas.h"
 #include "SkCanvasPriv.h"
@@ skipping 1975 matching lines @@
     this->internalDrawBitmapNine(bitmap, center, dst, paint);
 }
 
 class SkDeviceFilteredPaint {
 public:
     SkDeviceFilteredPaint(SkBaseDevice* device, const SkPaint& paint) {
         SkBaseDevice::TextFlags flags;
         if (device->filterTextFlags(paint, &flags)) {
             SkPaint* newPaint = fLazy.set(paint);
             newPaint->setFlags(flags.fFlags);
-            newPaint->setHinting(flags.fHinting);
             fPaint = newPaint;
         } else {
             fPaint = &paint;
         }
     }
 
     const SkPaint& paint() const { return *fPaint; }
 
 private:
     const SkPaint*  fPaint;
@@ skipping 484 matching lines @@
     }
 
     if (matrix) {
         canvas->concat(*matrix);
     }
 }
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }