Add a preprocessor symbol to have printing on Android use stdout instead of the system log

This is convenient for debugging on Android as one don't have to go to the system log for printf based debugging.
Review URL: http://codereview.chromium.org/6672041

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7211 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-posix.cc

@@ -139,7 +139,7 @@ void OS::Print(const char* format, ...) {
 
 
 void OS::VPrint(const char* format, va_list args) {
-#if defined(ANDROID)
+#if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
   LOG_PRI_VA(ANDROID_LOG_INFO, LOG_TAG, format, args);
 #else
   vprintf(format, args);
@@ -156,7 +156,7 @@ void OS::FPrint(FILE* out, const char* format, ...) {
 
 
 void OS::VFPrint(FILE* out, const char* format, va_list args) {
-#if defined(ANDROID)
+#if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
   LOG_PRI_VA(ANDROID_LOG_INFO, LOG_TAG, format, args);
 #else
   vfprintf(out, format, args);
@@ -173,7 +173,7 @@ void OS::PrintError(const char* format, ...) {
 
 
 void OS::VPrintError(const char* format, va_list args) {
-#if defined(ANDROID)
+#if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
   LOG_PRI_VA(ANDROID_LOG_ERROR, LOG_TAG, format, args);
 #else
   vfprintf(stderr, format, args);