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/SampleLayerMask.cpp b/samplecode/SampleLayerMask.cpp
index 78b9800..d65c131 100644
--- a/samplecode/SampleLayerMask.cpp
+++ b/samplecode/SampleLayerMask.cpp
@@ -38,7 +38,7 @@
             int h = SkScalarRound(r.height());
             mask.setConfig(SkBitmap::kARGB_8888_Config, w, h);
             mask.allocPixels();
-            mask.eraseColor(0);
+            mask.eraseColor(SK_ColorTRANSPARENT);
             SkCanvas c(mask);
             SkRect bounds = r;
             bounds.offset(-bounds.fLeft, -bounds.fTop);