[TextBlob] Fix LCD text handling.

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 360 matching lines @@
     if (!isRecording())
         return m_canvas->getTotalMatrix();
 
     const RecordingState& recordingState = m_recordingStateStack.last();
     SkMatrix totalMatrix = recordingState.m_savedMatrix;
     totalMatrix.preConcat(m_canvas->getTotalMatrix());
 
     return totalMatrix;
 }
 
-void GraphicsContext::adjustTextRenderMode(SkPaint* paint)
+void GraphicsContext::adjustTextRenderMode(SkPaint* paint) const
 {
     if (contextDisabled())
         return;
 
     if (!paint->isLCDRenderText())
         return;
 
     paint->setLCDRenderText(couldUseLCDRenderedText());
 }
 
-bool GraphicsContext::couldUseLCDRenderedText()
+bool GraphicsContext::couldUseLCDRenderedText() const
 {
     // Our layers only have a single alpha channel. This means that subpixel
     // rendered text cannot be composited correctly when the layer is
     // collapsed. Therefore, subpixel text is contextDisabled when we are drawing
     // onto a layer.
     if (contextDisabled() || m_canvas->isDrawingToLayer() || !isCertainlyOpaque())
         return false;
 
     return shouldSmoothFonts();
 }
@@ skipping 1577 matching lines @@
         // FIXME: This is to not break tests (it results in the filter bitmap flag
         // being set to true). We need to decide if we respect InterpolationNone
         // being returned from computeInterpolationQuality.
         resampling = InterpolationLow;
     }
     resampling = limitInterpolationQuality(this, resampling);
     paint->setFilterLevel(static_cast<SkPaint::FilterLevel>(resampling));
 }
 
 } // namespace blink