Do not spam the debugging information

Currently, whenever there's a frame being rendered, we log such an
invalidation event. This is very spammy for animations or frame rates
test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2276303003

Review-Url: https://codereview.chromium.org/2276303003
diff --git a/tools/viewer/sk_app/android/surface_glue_android.cpp b/tools/viewer/sk_app/android/surface_glue_android.cpp
index 29d9ff0..886fcd0 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.cpp
+++ b/tools/viewer/sk_app/android/surface_glue_android.cpp
@@ -91,7 +91,6 @@
     auto skiaAndroidApp = (SkiaAndroidApp*)data;
     Message message;
     skiaAndroidApp->readMessage(&message);
-    SkDebugf("message_callback %d", message.fType);
     SkASSERT(message.fType != kUndefined);
 
     switch (message.fType) {