Don't create new descriptor set for vulkan uniforms every draw

src/gpu/vk/GrVkBuffer.h

Index: src/gpu/vk/GrVkBuffer.h
diff --git a/src/gpu/vk/GrVkBuffer.h b/src/gpu/vk/GrVkBuffer.h
index 289ef30d7fa703c96442f770a89f32c32845c8c8..141b2a378f3e6fed4a10ca652257ac0ccdcfc457 100644
--- a/src/gpu/vk/GrVkBuffer.h
+++ b/src/gpu/vk/GrVkBuffer.h
@@ -73,7 +73,10 @@ protected:
 
     void* vkMap(const GrVkGpu* gpu);
     void vkUnmap(const GrVkGpu* gpu);
-    bool vkUpdateData(const GrVkGpu* gpu, const void* src, size_t srcSizeInBytes);
+    // If the caller passes in a non null createdNewBuffer, this function will set the bool to true
+    // if it creates a new VkBuffer to upload the data to.
+    bool vkUpdateData(const GrVkGpu* gpu, const void* src, size_t srcSizeInBytes,
+                      bool* createdNewBuffer = nullptr);
 
     void vkAbandon();
     void vkRelease(const GrVkGpu* gpu);