Move Partition Allocator into Chromium base.

base/compiler_specific.h

Index: base/compiler_specific.h
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 0f4c058b3be43963d76c23b0b3b8ec89fc8b3767..278ef924f91ee36a70bf4042ecfd3aebd930ef72 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -230,4 +230,18 @@
 #define HAS_FEATURE(FEATURE) 0
 #endif
 
+#if defined(COMPILER_GCC)
+#define PRETTY_FUNCTION __PRETTY_FUNCTION__
+#elif defined(COMPILER_MSVC)
+#define PRETTY_FUNCTION __FUNCSIG__
+#else
+#define PRETTY_FUNCTION __func__
+#endif
+
+// Returns a string that contains the type name of |T| as a substring.
+template <typename T>
+inline const char* GetStringWithTypeName() {
+  return PRETTY_FUNCTION;
+}
+
 #endif  // BASE_COMPILER_SPECIFIC_H_