Add support for getting vulkan descriptor sets without a GrVkUniformHandler.

src/gpu/vk/GrVkDescriptorSetManager.h

Index: src/gpu/vk/GrVkDescriptorSetManager.h
diff --git a/src/gpu/vk/GrVkDescriptorSetManager.h b/src/gpu/vk/GrVkDescriptorSetManager.h
index 0b11eb3ba91d354c67efd7a34cd0b661c2be547d..84dd29ece0c0ab500f5d9dd20bc33bbfdf3df9ae 100644
--- a/src/gpu/vk/GrVkDescriptorSetManager.h
+++ b/src/gpu/vk/GrVkDescriptorSetManager.h
@@ -29,6 +29,11 @@ public:
     GrVkDescriptorSetManager(GrVkGpu* gpu,
                              VkDescriptorType,
                              const GrVkUniformHandler* handler = nullptr);
+
+    GrVkDescriptorSetManager(GrVkGpu* gpu,
+                             VkDescriptorType,
+                             const SkTArray<uint32_t>& visibilities);
+
     ~GrVkDescriptorSetManager() {}
 
     void abandon();
@@ -41,11 +46,16 @@ public:
     void recycleDescriptorSet(const GrVkDescriptorSet*);
 
     bool isCompatible(VkDescriptorType type, const GrVkUniformHandler*) const;
+    bool isCompatible(VkDescriptorType type,
+                      const SkTArray<uint32_t>& visibilities) const;
 
 private:
     struct DescriptorPoolManager {
         DescriptorPoolManager(VkDescriptorType type, GrVkGpu* gpu,
                               const GrVkUniformHandler* handler = nullptr);
+        DescriptorPoolManager(VkDescriptorType type, GrVkGpu* gpu,
+                              const SkTArray<uint32_t>& visibilities);
+
 
         ~DescriptorPoolManager() {
             SkASSERT(!fDescLayout);
@@ -71,6 +81,9 @@ private:
             kStartNumDescriptors = 16, // must be less than kMaxUniformDescriptors
         };
 
+        void init(GrVkGpu* gpu, VkDescriptorType type, const GrVkUniformHandler* uniformHandler,
+                  const SkTArray<uint32_t>* visibilities);
+
         void getNewPool(GrVkGpu* gpu);
     };