Update min Vulkan version to 1.0.8.0, and fix various bugs

src/gpu/vk/GrVkCommandBuffer.h

Index: src/gpu/vk/GrVkCommandBuffer.h
diff --git a/src/gpu/vk/GrVkCommandBuffer.h b/src/gpu/vk/GrVkCommandBuffer.h
index e9e3d767a9e676b77633f189d02c8150a5b07416..1b27c5517dde0d5b41585525e56e10b852d615e3 100644
--- a/src/gpu/vk/GrVkCommandBuffer.h
+++ b/src/gpu/vk/GrVkCommandBuffer.h
@@ -82,6 +82,8 @@ public:
         }
     }
 
+    void bindPipeline(const GrVkGpu* gpu, const GrVkPipeline* pipeline);
+
     void bindDescriptorSets(const GrVkGpu* gpu,
                             GrVkPipelineState*,
                             VkPipelineLayout layout,
@@ -154,9 +156,6 @@ public:
                           int numRects,
                           const VkClearRect* clearRects) const;
 
-    void bindPipeline(const GrVkGpu* gpu, const GrVkPipeline* pipeline);
-
-
     void drawIndexed(const GrVkGpu* gpu,
                      uint32_t indexCount,
                      uint32_t instanceCount,