Cut the spam in sky log printouts.

sky/engine/bindings/builtin_natives.cc

Index: sky/engine/bindings/builtin_natives.cc
diff --git a/sky/engine/bindings/builtin_natives.cc b/sky/engine/bindings/builtin_natives.cc
index d3d1216e3c6868d3b8e6bf5179599407960f8145..c403b9f1b04d847e458b243c0f0f7b81d3ae7cf7 100644
--- a/sky/engine/bindings/builtin_natives.cc
+++ b/sky/engine/bindings/builtin_natives.cc
@@ -26,6 +26,10 @@
 #include "sky/engine/tonic/dart_value.h"
 #include "sky/engine/wtf/text/WTFString.h"
 
+#if defined(OS_ANDROID)
+#include <android/log.h>
+#endif
+
 namespace blink {
 
 #define REGISTER_FUNCTION(name, count)                                         \
@@ -159,14 +163,16 @@ void Logger_PrintString(Dart_NativeArguments args) {
   if (Dart_IsError(result)) {
     Dart_PropagateError(result);
   } else {
-
-  String message(chars, length);
-  // TODO(dart): Hook up to developer console (if/when that's a thing).
-#if OS(ANDROID) || OS(IOS)
-    LOG(INFO) << "CONSOLE: " << message.utf8().data();
-#else
-    printf("CONSOLE: %s\n", message.utf8().data());
-    fflush(stdout);
+    // Uses fwrite to support printing NUL bytes.
+    fwrite(chars, 1, length, stdout);
+    fputs("\n", stdout);
+#if defined(OS_ANDROID)
+    // In addition to writing to the stdout, write to the logcat so that the
+    // message is discoverable when running on an unrooted device. Use the
+    // "chromium" tag to match native printouts produced by base LOG macros, so
+    // that the same rule will pick them up in scripts that stream relevant
+    // logcat output to host terminal.

[abarth-chromium, 2015/07/16 14:17:55]

Please remove this sentence about the "chromium" tag.  We're not part of the
Chromium project.

[ppi, 2015/07/16 16:18:47]

Done.

+    __android_log_print(ANDROID_LOG_INFO, "chromium", "%.*s", length, chars);

[abarth-chromium, 2015/07/16 14:17:55]

s/chromium/sky/

[ppi, 2015/07/16 16:18:47]

Done.

 #endif
   }
 }