[TextBlob] Fix LCD text handling.

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 56bb6b9bb4cabc1fbc3ba4df903e3f82ae8d43e3..7a9635fc388cd0ae684989e991a802ad48fabc72 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -168,8 +168,8 @@ public:
     bool shouldSmoothFonts() const { return m_shouldSmoothFonts; }
 
     // Turn off LCD text for the paint if not supported on this context.
-    void adjustTextRenderMode(SkPaint*);
-    bool couldUseLCDRenderedText();
+    void adjustTextRenderMode(SkPaint*) const;
+    bool couldUseLCDRenderedText() const;
 
     void setTextDrawingMode(TextDrawingModeFlags mode) { mutableState()->setTextDrawingMode(mode); }
     TextDrawingModeFlags textDrawingMode() const { return immutableState()->textDrawingMode(); }