Add GrGpu support for Vulkan command buffer flush

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 116 matching lines @@
 
     GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                                     GrPixelConfig config) override;
     bool isTestingOnlyBackendTexture(GrBackendObject) const override;
     void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) override;
 
     void resetShaderCacheForTesting() const override;
 
     void drawDebugWireRect(GrRenderTarget*, const SkIRect&, GrColor) override;
 
-    void performFlushWorkaround() override;
+    void finishDrawTarget() override;
 
 private:
     GrGLGpu(GrGLContext* ctx, GrContext* context);
 
     // GrGpu overrides
     void onResetContext(uint32_t resetBits) override;
 
     void xferBarrier(GrRenderTarget*, GrXferBarrierType) override;
 
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle lifeCycle,
@@ skipping 449 matching lines @@
     } fPLSSetupProgram;
 
     bool fHWPLSEnabled;
     bool fPLSHasBeenUsed;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif