Generate list of GPU contexts outside SurfaceTest tests

tests/Test.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #include "SkCommandLineFlags.h"
 #include "SkError.h"
 #include "SkString.h"
 #include "SkTime.h"
+#if SK_SUPPORT_GPU
+#include "GrContextFactory.h"
+#endif
 
 DEFINE_string2(tmpDir, t, nullptr, "Temp directory to use.");
 
 void skiatest::Reporter::bumpTestCount() {}
 
 bool skiatest::Reporter::allowExtendedTest() const { return false; }
 
 bool skiatest::Reporter::verbose() const { return false; }
 
 SkString skiatest::Failure::toString() const {
     SkString result = SkStringPrintf("%s:%d\t", this->fileName, this->lineNo);
     if (!this->message.isEmpty()) {
         result.append(this->message);
         if (strlen(this->condition) > 0) {
             result.append(": ");
         }
     }
     result.append(this->condition);
     return result;
 }
 
 SkString skiatest::GetTmpDir() {
     const char* tmpDir = FLAGS_tmpDir.isEmpty() ? nullptr : FLAGS_tmpDir[0];
     return SkString(tmpDir);
 }
+