Setup system in Vulkan to reuse VkDescriptorSet allocations.

src/gpu/vk/GrVkCommandBuffer.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 "GrVkCommandBuffer.h"
 
 #include "GrVkFramebuffer.h"
@@ skipping 55 matching lines @@
     for (int i = 0; i < fTrackedResources.count(); ++i) {
         fTrackedResources[i]->unref(gpu);
     }
     fTrackedResources.reset();
 
     for (int i = 0; i < fTrackedRecycledResources.count(); ++i) {
         fTrackedRecycledResources[i]->recycle(const_cast<GrVkGpu*>(gpu));
     }
     fTrackedRecycledResources.reset();
 
-
     this->invalidateState();
 
     // we will retain resources for later use
     VkCommandBufferResetFlags flags = 0;
     GR_VK_CALL(gpu->vkInterface(), ResetCommandBuffer(fCmdBuffer, flags));
 
     this->onReset(gpu);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 545 matching lines @@
     fIsActive = true;
 }
 
 void GrVkSecondaryCommandBuffer::end(const GrVkGpu* gpu) {
     SkASSERT(fIsActive);
     GR_VK_CALL_ERRCHECK(gpu->vkInterface(), EndCommandBuffer(fCmdBuffer));
     this->invalidateState();
     fIsActive = false;
 }