Fix valgrind uninitialized memory complaint

https://codereview.chromium.org/26469003/



git-svn-id: http://skia.googlecode.com/svn/trunk@11664 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index 96a5560..61c1e2d 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -84,6 +84,7 @@
     SkBitmap testBitmap;
     testBitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
     testBitmap.allocPixels();
+    testBitmap.eraseColor(0);
 
     SkRRect testRRect;
     testRRect.setRectXY(testRect, SK_Scalar1, SK_Scalar1);