Move PdfTokenLooper into its own file.

experimental/PdfViewer/inc/SkPdfTokenLooper.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.
+ */
+
+#ifndef SkPdfTokenLooper_DEFINED
+#define SkPdfTokenLooper_DEFINED
+
+class SkCanvas;
+class SkPdfNativeTokenizer;
+class SkPdfContext;
+
+class PdfTokenLooper {
+protected:
+    PdfTokenLooper* fParent;
+    SkPdfNativeTokenizer* fTokenizer;
+    SkPdfContext* fPdfContext;
+    SkCanvas* fCanvas;
+
+public:
+    PdfTokenLooper(PdfTokenLooper* parent,
+                   SkPdfNativeTokenizer* tokenizer,
+                   SkPdfContext* pdfContext,
+                   SkCanvas* canvas)
+        : fParent(parent), fTokenizer(tokenizer), fPdfContext(pdfContext), fCanvas(canvas) {}
+
+    virtual ~PdfTokenLooper() {}
+
+    virtual SkPdfResult consumeToken(PdfToken& token) = 0;
+    virtual void loop() = 0;
+
+    void setUp(PdfTokenLooper* parent) {
+        fParent = parent;
+        fTokenizer = parent->fTokenizer;
+        fPdfContext = parent->fPdfContext;
+        fCanvas = parent->fCanvas;
+    }
+
+    SkPdfNativeTokenizer* tokenizer() { return fTokenizer; }
+};
+#endif // SkPdfTokenLooper_DEFINED