Clean up a few includes, introduce iwyu.

src/ports/SkFontMgr_android_parser.h

 /*
  * Copyright 2011 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkFontMgr_android_parser_DEFINED
 #define SkFontMgr_android_parser_DEFINED
 
+#include "SkFixed.h"
 #include "SkString.h"
+#include "SkTArray.h"
 #include "SkTDArray.h"
+#include "SkTypes.h"
 
 #include <climits>
 #include <limits>
 
 /** \class SkLanguage
 
     The SkLanguage class represents a human written language, and is used by
     text draw operations to determine which glyph to draw when drawing
     characters with variants (ie Han-derived characters).
 */
@@ skipping 183 matching lines @@
     }
     if (negate) {
         n = -n;
         frac = -frac;
     }
     *value = (n << N) + frac;
     return true;
 }
 
 #endif /* SkFontMgr_android_parser_DEFINED */