Rename ENABLE(DEFAULT_RENDER_THEME) to USE(DEFAULT_RENDER_THEME).

Source/config.h

Index: Source/config.h
diff --git a/Source/config.h b/Source/config.h
index ce9c334fc09d1fb6bb60961ffccdfe621c434077..bc86ad09f731f774fff7b41425349629550d235a 100644
--- a/Source/config.h
+++ b/Source/config.h
@@ -182,3 +182,8 @@
 #if OS(LINUX) || OS(ANDROID)
 #define WTF_USE_HARFBUZZ 1
 #endif
+
+# Populate USE() macros from global USE_ defines
+#if defined(USE_DEFAULT_RENDER_THEME)
+#define WTF_USE_DEFAULT_RENDER_THEME 1
+#endif

[abarth-chromium, 2013/09/20 16:49:50]

This is strange.  Do we do this elsewhere?

[lgombos, 2013/09/20 17:47:19]

Glad you spotted this; I was not sure about the proposed approach here, but this
is the best I could come up with. I am interested if this is a right direction
as I suspect we will have more of a similar kind of situation.

USE_DEFAULT_RENDER_THEME is a global define set in
https://code.google.com/p/chromium/codesearch#chromium/src/build/common.gypi&...

A few other options:
 1./ Set WTF_USE_DEFAULT_RENDER_THEME in common.gypi at the same time when
USE_DEFAULT_RENDER_THEME is set - I think it is not favorable to set WTF_ scoped
macros in the project global gypi file.

 2./ Leave it as it is and set WTF_USE_DEFAULT_RENDER_THEME in
core/features.gypi - it seems we wanted to get away from this approach and set
WTF_USE in config.h instead

 3./ Do not use USE() guard in blink for global guards and instead just stick to
defined(USE_DEFAULT_RENDER_THEME) as a guard

Do you have other ideas ? Which one you think is more maintainable/less pain
going forward ?