Make SkTextBlob::RunIterator public.

tests/TextBlobTest.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaint.h"
 #include "SkPoint.h"
-#include "SkTextBlob.h"
+#include "SkTextBlobPriv.h"
 
 #include "Test.h"
 
 class TextBlobTester {
 public:
     // This unit test feeds an SkTextBlobBuilder various runs then checks to see if
     // the result contains the provided data and merges runs when appropriate.
     static void TestBuilder(skiatest::Reporter* reporter) {
         SkTextBlobBuilder builder;
 
@@ skipping 233 matching lines @@
         default:
             SkFAIL("unhandled positioning value");
         }
     }
 };
 
 DEF_TEST(TextBlob_builder, reporter) {
     TextBlobTester::TestBuilder(reporter);
     TextBlobTester::TestBounds(reporter);
 }