Faster text clipping

Change-Id: I03a00c4261d81a416b1ad7b86ce2d432c71908b4
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 2fc88e1..cd9ff93 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -123,7 +123,7 @@
     virtual void drawLines(float* points, int count, SkPaint* paint);
     virtual void drawPoints(float* points, int count, SkPaint* paint);
     virtual void drawText(const char* text, int bytesCount, int count, float x, float y,
-            SkPaint* paint);
+            SkPaint* paint, float length = -1.0f);
 
     virtual void resetShader();
     virtual void setupShader(SkiaShader* shader);