Clean up a few includes, introduce iwyu.

src/ports/SkFontMgr_custom.cpp

 /*
  * Copyright 2006 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.
  */
 
+#include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
-#include "SkFontDescriptor.h"
 #include "SkFontMgr.h"
 #include "SkFontMgr_custom.h"
-#include "SkDescriptor.h"
+#include "SkFontStyle.h"
 #include "SkOSFile.h"
-#include "SkPaint.h"
-#include "SkRTConf.h"
+#include "SkRefCnt.h"
+#include "SkStream.h"
 #include "SkString.h"
-#include "SkStream.h"
-#include "SkTSearch.h"
+#include "SkTArray.h"
+#include "SkTemplates.h"
+#include "SkTypeface.h"
 #include "SkTypefaceCache.h"
-#include "SkTArray.h"
+#include "SkTypes.h"
 
 #include <limits>
 
+class SkData;
+
 /** The base SkTypeface implementation for the custom font manager. */
 class SkTypeface_Custom : public SkTypeface_FreeType {
 public:
     SkTypeface_Custom(const SkFontStyle& style, bool isFixedPitch,
                       bool sysFont, const SkString familyName, int index)
         : INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch)
         , fIsSysFont(sysFont), fFamilyName(familyName), fIndex(index)
     { }
 
     bool isSysFont() const { return fIsSysFont; }
@@ skipping 470 matching lines @@
             addTo->appendTypeface(tf);
         }
     }
 
     const SkEmbeddedResourceHeader* fHeader;
 };
 
 SkFontMgr* SkFontMgr_New_Custom_Embedded(const SkEmbeddedResourceHeader* header) {
     return new SkFontMgr_Custom(EmbeddedSystemFontLoader(header));
 }