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/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 458cb61..9d51f9b 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -1023,7 +1023,7 @@
     } else {
         // if the src has alpha, we have to clear the dst first
         if (!src->isOpaque()) {
-            tmpDst.eraseColor(0);
+            tmpDst.eraseColor(SK_ColorTRANSPARENT);
         }
 
         SkCanvas canvas(tmpDst);