Clean up a few includes, introduce iwyu.

include/ports/SkFontMgr_indirect.h

Index: include/ports/SkFontMgr_indirect.h
diff --git a/include/ports/SkFontMgr_indirect.h b/include/ports/SkFontMgr_indirect.h
index 96ba3632d5f5c413644756464fafb61855729672..6fd5bd9b2d5be680e1942724a18cbeb3ecde42f6 100644
--- a/include/ports/SkFontMgr_indirect.h
+++ b/include/ports/SkFontMgr_indirect.h
@@ -10,16 +10,19 @@
 
 #include "SkDataTable.h"
 #include "SkFontMgr.h"
-#include "SkFontStyle.h"
 #include "SkMutex.h"
+#include "SkRefCnt.h"
 #include "SkRemotableFontMgr.h"
 #include "SkTArray.h"
 #include "SkTypeface.h"
+#include "SkTypes.h"
+
+#include <stddef.h>

[mtklein, 2015/07/28 22:04:19]

I think I like SkTypes providing size_t.  Is that what this is for?

[bungeman-skia, 2015/07/29 16:46:23]

It isn't! Well, it was by accident by including string.h (in SkPostConfig.h).
Will make SkTypes provide this explicitly through stddef.h (which is much
smaller and saner than other headers).

 
 class SkData;
-class SkStream;
+class SkFontStyle;
+class SkStreamAsset;
 class SkString;
-class SkTypeface;
 
 class SK_API SkFontMgr_Indirect : public SkFontMgr {
 public: