Tests: reduce verbosity

Review URL: https://codereview.chromium.org/1526943003
diff --git a/tests/BitmapTest.cpp b/tests/BitmapTest.cpp
index 58e3c8b..015b917 100644
--- a/tests/BitmapTest.cpp
+++ b/tests/BitmapTest.cpp
@@ -151,7 +151,9 @@
   SkBitmap bm;
   bm.allocPixels(SkImageInfo::Make(1, 1, ct, kPremul_SkAlphaType));
   bm.eraseColor(input);
-  SkDebugf("expected: %x actual: %x\n", expected, bm.getColor(0, 0));
+  if (reporter->verbose()) {
+      SkDebugf("expected: %x actual: %x\n", expected, bm.getColor(0, 0));
+  }
   REPORTER_ASSERT(reporter, bm.getColor(0, 0) == expected);
 }