Make existing unit tests only run on GL contexts

tools/gpu/GrContextFactory.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrContextFactory_DEFINED
 #define GrContextFactory_DEFINED
 
@@ skipping 62 matching lines @@
     static bool IsRenderingContext(ContextType type) {
         switch (type) {
             case kNullGL_ContextType:
             case kDebugGL_ContextType:
                 return false;
             default:
                 return true;
         }
     }
 
+    static GrBackend ContextTypeBackend(ContextType type) {
+        // Currently all the context types use the GL backed
+        return kOpenGL_GrBackend;
+    }
+
     static const char* ContextTypeName(ContextType type) {
         switch (type) {
             case kGL_ContextType:
                 return "gl";
             case kGLES_ContextType:
                 return "gles";
 #if SK_ANGLE
 #ifdef SK_BUILD_FOR_WIN
             case kANGLE_ContextType:
                 return "angle";
@@ skipping 45 matching lines @@
         ContextType         fType;
         ContextOptions      fOptions;
         GLTestContext*      fGLContext; //  null if non-GL
         GrContext*          fGrContext;
     };
     SkTArray<Context, true> fContexts;
     const GrContextOptions  fGlobalOptions;
 };
 }  // namespace sk_gpu_test
 #endif