Implement various vulkan stencil clears and fix various stenciling bugs.

src/gpu/vk/GrVkCommandBuffer.h

 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef GrVkCommandBuffer_DEFINED
 #define GrVkCommandBuffer_DEFINED
 
@@ skipping 96 matching lines @@
                             uint32_t dynamicOffsetCount,
                             const uint32_t* dynamicOffsets);
 
     // Commands that only work outside of a render pass
     void clearColorImage(const GrVkGpu* gpu,
                          GrVkImage* image,
                          const VkClearColorValue* color,
                          uint32_t subRangeCount,
                          const VkImageSubresourceRange* subRanges);
 
+    void clearDepthStencilImage(const GrVkGpu* gpu,
+                                GrVkImage* image,
+                                const VkClearDepthStencilValue* color,
+                                uint32_t subRangeCount,
+                                const VkImageSubresourceRange* subRanges);
+
     void copyImage(const GrVkGpu* gpu,
                    GrVkImage* srcImage,
                    VkImageLayout srcLayout,
                    GrVkImage* dstImage,
                    VkImageLayout dstLayout,
                    uint32_t copyRegionCount,
                    const VkImageCopy* copyRegions);
 
     void copyImageToBuffer(const GrVkGpu* gpu,
                            GrVkImage* srcImage,
@@ skipping 70 matching lines @@
 
     // Stores a pointer to the current active render pass (i.e. begin has been called but not end).
     // A nullptr means there is no active render pass. The GrVKCommandBuffer does not own the render
     // pass.
     const GrVkRenderPass*     fActiveRenderPass;
 };
 
 
 #endif