Start making all .cpp files compile-able on all platforms.

src/ports/SkDebug_android.cpp

Index: src/ports/SkDebug_android.cpp
diff --git a/src/ports/SkDebug_android.cpp b/src/ports/SkDebug_android.cpp
index 4ab9ad24d3f1f1edc06fbc7c5699394286bed991..0a1b59a2cd0a2cba4f27b6607d4712925a0a3345 100644
--- a/src/ports/SkDebug_android.cpp
+++ b/src/ports/SkDebug_android.cpp
@@ -6,6 +6,8 @@
  */
 
 #include "SkTypes.h"
+#if defined(SK_BUILD_FOR_ANDROID)
+
 #include <stdio.h>
 
 #define LOG_TAG "skia"
@@ -30,3 +32,5 @@ void SkDebugf(const char format[], ...) {
 
     va_end(args1);
 }
+
+#endif//defined(SK_BUILD_FOR_ANDROID)