Enable tcmalloc's logging in Android.

third_party/tcmalloc/chromium/src/base/logging.h

Index: third_party/tcmalloc/chromium/src/base/logging.h
diff --git a/third_party/tcmalloc/chromium/src/base/logging.h b/third_party/tcmalloc/chromium/src/base/logging.h
index 5b5b5dbfd69566a0b6e9152a0d99725d07765d4e..02f84f4348b4601098dc4ce9fbd4c2b4507c1212 100644
--- a/third_party/tcmalloc/chromium/src/base/logging.h
+++ b/third_party/tcmalloc/chromium/src/base/logging.h
@@ -56,6 +56,10 @@
 // do logging on a best-effort basis.
 #if defined(_MSC_VER)
 #define WRITE_TO_STDERR(buf, len) WriteToStderr(buf, len);  // in port.cc
+#elif defined(__ANDROID__) || defined(ANDROID)
+#include <android/log.h>
+#define WRITE_TO_STDERR(buf, len) \
+    __android_log_write(ANDROID_LOG_ERROR, "gperftools", buf)
 #elif defined(HAVE_SYS_SYSCALL_H)
 #include <sys/syscall.h>
 #define WRITE_TO_STDERR(buf, len) syscall(SYS_write, STDERR_FILENO, buf, len)
@@ -204,7 +208,30 @@ inline void LogPrintf(int severity, const char* pat, va_list ap) {
     assert(strlen(buf)+1 < sizeof(buf));
     strcat(buf, "\n");
   }
+#if defined(__ANDROID__) || defined(ANDROID)
+  android_LogPriority priority = ANDROID_LOG_UNKNOWN;
+  switch (severity) {
+    case INFO: {
+      priority = ANDROID_LOG_INFO;
+      break;
+    }
+    case WARNING: {
+      priority = ANDROID_LOG_WARN;
+      break;
+    }
+    case ERROR: {
+      priority = ANDROID_LOG_ERROR;
+      break;
+    }
+    case FATAL: {
+      priority = ANDROID_LOG_FATAL;
+      break;
+    }
+  }
+  __android_log_write(priority, "gperftools", buf);
+#else  // defined(__ANDROID__) || defined(ANDROID)
   WRITE_TO_STDERR(buf, strlen(buf));
+#endif  // defined(__ANDROID__) || defined(ANDROID)
   if ((severity) == FATAL) {
     // LOG(FATAL) indicates a big problem, so don't run atexit() calls
     tcmalloc::Abort();