Defining new color constat for transparent color
Review URL: https://codereview.appspot.com/6901044

git-svn-id: http://skia.googlecode.com/svn/trunk@6696 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleStrokeText.cpp b/samplecode/SampleStrokeText.cpp
index 8245f4e..4ceb0d5 100644
--- a/samplecode/SampleStrokeText.cpp
+++ b/samplecode/SampleStrokeText.cpp
@@ -48,7 +48,7 @@
     SkBitmap src;
     src.setConfig(config, w, h);
     src.allocPixels();
-    src.eraseColor(0);
+    src.eraseColor(SK_ColorTRANSPARENT);
     {
         SkCanvas canvas(src);
         paint.setAntiAlias(true);