Add SK_ALWAYS_INLINE.

include/core/SkPostConfig.h

Index: include/core/SkPostConfig.h
diff --git a/include/core/SkPostConfig.h b/include/core/SkPostConfig.h
index 1aff89953d9e576ecca98e16bf86471738f7826d..9ba199f2e9be25ba5c251fd6b1bd6b68ecdb2d94 100644
--- a/include/core/SkPostConfig.h
+++ b/include/core/SkPostConfig.h
@@ -379,6 +379,18 @@
     #define SK_ATTR_DEPRECATED(msg) SK_ATTRIBUTE(deprecated)
 #endif
 
+// If your judgment is better than the compiler's (i.e. you've profiled it),
+// you can use SK_ALWAYS_INLINE to force inlining. E.g.
+//     inline void someMethod() { ... }             // may not be inlined
+//     SK_ALWAYS_INLINE void someMethod() { ... }   // should always be inlined
+#if !defined(SK_ALWAYS_INLINE)
+#  if defined(SK_BUILD_FOR_WIN)
+#    define SK_ALWAYS_INLINE __forceinline
+#  else
+#    define SK_ALWAYS_INLINE SK_ATTRIBUTE(always_inline) inline
+#  endif
+#endif
+
 //////////////////////////////////////////////////////////////////////
 
 #if defined(__clang__) || defined(__GNUC__)