Support High Contrast Text for all canvas types

Change-Id: Iee324446798fe1a1cb32cb991f181a4af24aa93c
diff --git a/libs/hwui/Canvas.h b/libs/hwui/Canvas.h
index 116bc56..a0b87f9 100644
--- a/libs/hwui/Canvas.h
+++ b/libs/hwui/Canvas.h
@@ -62,6 +62,9 @@
     virtual int width() = 0;
     virtual int height() = 0;
 
+    virtual void setHighContrastText(bool highContrastText) = 0;
+    virtual bool isHighContrastText() = 0;
+
 // ----------------------------------------------------------------------------
 // Canvas state operations
 // ----------------------------------------------------------------------------