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/SampleMipMap.cpp b/samplecode/SampleMipMap.cpp
index e0a8e4d..f3a12cd 100644
--- a/samplecode/SampleMipMap.cpp
+++ b/samplecode/SampleMipMap.cpp
@@ -16,7 +16,7 @@
     SkBitmap bitmap;
     bitmap.setConfig(SkBitmap::kARGB_8888_Config, n, n);
     bitmap.allocPixels();
-    bitmap.eraseColor(0);
+    bitmap.eraseColor(SK_ColorTRANSPARENT);
 
     SkCanvas canvas(bitmap);
     SkRect r;
@@ -83,7 +83,7 @@
 
         SkAutoCanvasRestore acr(canvas, true);
         for (int i = 0; i < 6; i++) {
-            bg.eraseColor(0);
+            bg.eraseColor(SK_ColorTRANSPARENT);
             SkCanvas c(bg);
             c.scale(SK_Scalar1 / (1 << i), SK_Scalar1 / (1 << i));
             c.drawBitmap(bitmap, 0, 0, NULL);