Add GrGpu support for Vulkan command buffer flush

src/gpu/gl/GrGLGpu.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 "GrGLGpu.h"
 #include "GrGLGLSL.h"
 #include "GrGLStencilAttachment.h"
@@ skipping 2399 matching lines @@
             if (!flipY) {
                 dst += rowBytes;
             } else {
                 dst -= rowBytes;
             }
         }
     }
     return true;
 }
 
-void GrGLGpu::performFlushWorkaround() {
+void GrGLGpu::finishDrawTarget() {
     if (fPLSHasBeenUsed) {
         /* There is an ARM driver bug where if we use PLS, and then draw a frame which does not 
          * use PLS, it leaves garbage all over the place. As a workaround, we use PLS in a 
          * trivial way every frame. And since we use it every frame, there's never a point at which
          * it becomes safe to stop using this workaround once we start.
          */
         this->disableScissor();
         // using PLS in the presence of MSAA results in GL_INVALID_OPERATION
         this->flushHWAAState(nullptr, false, false);
         SkASSERT(!fHWPLSEnabled);
@@ skipping 1460 matching lines @@
         if (GR_GL_TEXTURE_EXTERNAL == glTexture->target() ||
             GR_GL_TEXTURE_RECTANGLE == glTexture->target()) {
             copyParams->fFilter = GrTextureParams::kNone_FilterMode;
             copyParams->fWidth = texture->width();
             copyParams->fHeight = texture->height();
             return true;
         }
     }
     return false;
 }