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/gm/xfermodes.cpp b/gm/xfermodes.cpp
index 22b6edd..8934bc7 100644
--- a/gm/xfermodes.cpp
+++ b/gm/xfermodes.cpp
@@ -15,7 +15,7 @@
 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
     src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
     src->allocPixels();
-    src->eraseColor(0);
+    src->eraseColor(SK_ColorTRANSPARENT);
 
     SkPaint p;
     p.setAntiAlias(true);
@@ -33,7 +33,7 @@
 
     dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
     dst->allocPixels();
-    dst->eraseColor(0);
+    dst->eraseColor(SK_ColorTRANSPARENT);
 
     {
         SkCanvas c(*dst);