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/SampleDither.cpp b/samplecode/SampleDither.cpp
index 7e5fc21..259bc94 100644
--- a/samplecode/SampleDither.cpp
+++ b/samplecode/SampleDither.cpp
@@ -76,7 +76,7 @@
     bm->eraseColor(SK_ColorBLUE);
     return;
 #else
-    bm->eraseColor(0);
+    bm->eraseColor(SK_ColorTRANSPARENT);
 #endif
 
     SkCanvas c(*bm);