Implement various vulkan stencil clears and fix various stenciling bugs.

src/gpu/vk/GrVkRenderPass.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 "GrVkRenderPass.h"
 
 #include "GrVkFramebuffer.h"
 #include "GrVkGpu.h"
 #include "GrVkRenderTarget.h"
 #include "GrVkUtil.h"
 
 void setup_simple_vk_attachment_description(VkAttachmentDescription* attachment,
                                             VkFormat format,
                                             uint32_t samples,
                                             VkImageLayout layout) {
     attachment->flags = 0;
     attachment->format = format;
     SkAssertResult(GrSampleCountToVkSampleCount(samples, &attachment->samples));
     attachment->loadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
     attachment->storeOp = VK_ATTACHMENT_STORE_OP_STORE;
     attachment->stencilLoadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
-    attachment->storeOp = VK_ATTACHMENT_STORE_OP_STORE;
+    attachment->stencilStoreOp = VK_ATTACHMENT_STORE_OP_STORE;
     attachment->initialLayout = layout;
     attachment->finalLayout = layout;
 }
 
 void GrVkRenderPass::initSimple(const GrVkGpu* gpu, const GrVkRenderTarget& target) {
     // Get attachment information from render target. This includes which attachments the render
     // target has (color, resolve, stencil) and the attachments format and sample count.
     target.getAttachmentsDescriptor(&fAttachmentsDescriptor, &fAttachmentFlags);
 
     uint32_t numAttachments = fAttachmentsDescriptor.fAttachmentCount;
@@ skipping 175 matching lines @@
         }
     }
     if (fAttachmentFlags & kStencil_AttachmentFlag) {
         if (fAttachmentsDescriptor.fStencil != desc.fStencil) {
             return false;
         }
     }
 
     return true;
 }