Add GrContext::releaseAndAbandonContext()

dm/DMGpuSupport.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMGpuSupport_DEFINED
 #define DMGpuSupport_DEFINED
 
@@ skipping 66 matching lines @@
                                kNative_GLContextType        = 0,
                                kNull_GLContextType          = 0;
     static const int kGLContextTypeCnt = 1;
     enum GLContextOptions {
         kNone_GLContextOptions = 0,
         kEnableNVPR_GLContextOptions = 0x1,
     };
     void destroyContexts() {}
 
     void abandonContexts() {}
+
+    void releaseResourcesAndAbandonContexts() {}
 };
 }  // namespace sk_gpu_test
 
 namespace DM {
 
 static const bool kGPUDisabled = true;
 
 static inline SkSurface* NewGpuSurface(sk_gpu_test::GrContextFactory*,
                                        sk_gpu_test::GrContextFactory::GLContextType,
                                        sk_gpu_test::GrContextFactory::GLContextOptions,
                                        SkImageInfo,
                                        int,
                                        bool) {
     return nullptr;
 }
 
 }  // namespace DM
 
 #endif//SK_SUPPORT_GPU
 
 #endif//DMGpuSupport_DEFINED