Fix stall in Vk clear

src/gpu/vk/GrVkGpu.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkGpu.h"
 
 #include "GrContextOptions.h"
@@ skipping 1023 matching lines @@
 
         VkClearRect clearRect;
         // Flip rect if necessary
         SkIRect vkRect = rect;
         if (kBottomLeft_GrSurfaceOrigin == vkRT->origin()) {
             vkRect.fTop = vkRT->height() - rect.fBottom;
             vkRect.fBottom = vkRT->height() - rect.fTop;
         }
         clearRect.rect.offset = { vkRect.fLeft, vkRect.fTop };
         clearRect.rect.extent = { (uint32_t)vkRect.width(), (uint32_t)vkRect.height() };
+        clearRect.baseArrayLayer = 0;
+        clearRect.layerCount = 1;
 
         const GrVkRenderPass* renderPass = vkRT->simpleRenderPass();
         SkASSERT(renderPass);
         fCurrentCmdBuffer->beginRenderPass(this, renderPass, *vkRT);
 
         uint32_t colorIndex;
         SkAssertResult(renderPass->colorAttachmentIndex(&colorIndex));
 
         VkClearAttachment attachment;
         attachment.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
@@ skipping 356 matching lines @@
     int set_a_break_pt_here = 9;
     aglSwapBuffers(aglGetCurrentContext());
 #elif defined(SK_BUILD_FOR_WIN32)
     SwapBuf();
     int set_a_break_pt_here = 9;
     SwapBuf();
 #endif
 #endif
 }