Move SkPdfContext into its own files.

experimental/PdfViewer/SkPdfFont.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // TODO(edisonn): this file not commented much on purpose.
 // It will probably need heavy refactoring soon anyway to support all encodings, fonts and
 // proper text sizing and spacing
 
 #ifndef SkPdfFont_DEFINED
 #define SkPdfFont_DEFINED
 
-#include "SkPdfGraphicsState.h"
+#include "SkPdfContext.h"
 #include "SkPdfHeaders_autogen.h"
 #include "SkPdfMapper_autogen.h"
 #include "SkPdfUtils.h"
 #include "SkTypeface.h"
 #include "SkTDict.h"
 #include "SkUtils.h"
 
 class SkPdfType0Font;
 class SkPdfType1Font;
 class SkPdfType3Font;
@@ skipping 445 matching lines @@
                 SkDoubleToScalar(pdfContext->fGraphicsState.fCurFontSize *
                                      fChars[ch - fFirstChar].fWidth),
                 SkDoubleToScalar(0.0));
         return fChars[ch - fFirstChar].fWidth;
     }
 
     virtual void afterWord(SkPaint* paint, SkMatrix* matrix) {}
 };
 
 #endif  // SkPdfFont_DEFINED