Add missing text blob SkDrawCommand string.

R=robertphillips@google.com

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/510853002
diff --git a/src/utils/debugger/SkDrawCommand.cpp b/src/utils/debugger/SkDrawCommand.cpp
index 3cebca2..3b1a028 100644
--- a/src/utils/debugger/SkDrawCommand.cpp
+++ b/src/utils/debugger/SkDrawCommand.cpp
@@ -54,6 +54,7 @@
         case DRAW_RRECT: return "Draw RRect";
         case DRAW_SPRITE: return "Draw Sprite";
         case DRAW_TEXT: return "Draw Text";
+        case DRAW_TEXT_BLOB: return "Draw Text Blob";
         case DRAW_TEXT_ON_PATH: return "Draw Text On Path";
         case DRAW_VERTICES: return "Draw Vertices";
         case RESTORE: return "Restore";