Save comparisons for release.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=1997003003

Review-Url: https://codereview.chromium.org/1997003003
diff --git a/tools/viewer/sk_app/android/surface_glue_android.cpp b/tools/viewer/sk_app/android/surface_glue_android.cpp
index 9e35407..3a4fca5 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.cpp
+++ b/tools/viewer/sk_app/android/surface_glue_android.cpp
@@ -77,11 +77,13 @@
 }
 
 void SkiaAndroidApp::postMessage(const Message& message) const {
-    SkAssertResult(write(fPipes[1], &message, sizeof(message)) == sizeof(message));
+    SkDEBUGCODE(auto writeSize =) write(fPipes[1], &message, sizeof(message));
+    SkASSERT(writeSize == sizeof(message));
 }
 
 void SkiaAndroidApp::readMessage(Message* message) const {
-    SkAssertResult(read(fPipes[0], message, sizeof(Message)) == sizeof(Message));
+    SkDEBUGCODE(auto readSize =) read(fPipes[0], message, sizeof(Message));
+    SkASSERT(readSize == sizeof(Message));
 }
 
 void SkiaAndroidApp::inval() {