Recycle small uniform buffers.

src/gpu/vk/GrVkResourceProvider.h

Index: src/gpu/vk/GrVkResourceProvider.h
diff --git a/src/gpu/vk/GrVkResourceProvider.h b/src/gpu/vk/GrVkResourceProvider.h
index cd0411b83b96a2b953b3a4f53438034502f25b2a..0660e91436d9304521b7f84797c94eec3e23e8a5 100644
--- a/src/gpu/vk/GrVkResourceProvider.h
+++ b/src/gpu/vk/GrVkResourceProvider.h
@@ -128,6 +128,14 @@ public:
     void recycleDescriptorSet(const GrVkDescriptorSet* descSet,
                               const GrVkDescriptorSetManager::Handle&);
 
+    // Creates or finds free uniform buffer resources of size GrVkUniformBuffer::kStandardSize.
+    // Anything larger will need to be created and released by the client.
+    const GrVkResource* findOrCreateStandardUniformBufferResource();
+
+    // Signals that the resource passed to it (which should be a uniform buffer resource)
+    // can be reused by the next uniform buffer resource request.
+    void recycleStandardUniformBufferResource(const GrVkResource*);
+
     // Destroy any cached resources. To be called before destroying the VkDevice.
     // The assumption is that all queues are idle and all command buffers are finished.
     // For resource tracing to work properly, this should be called after unrefing all other
@@ -226,6 +234,9 @@ private:
     // Array of available secondary command buffers
     SkSTArray<16, GrVkSecondaryCommandBuffer*> fAvailableSecondaryCommandBuffers;
 
+    // Array of available uniform buffer resources
+    SkSTArray<16, const GrVkResource*> fAvailableUniformBufferResources;
+
     // Stores GrVkSampler objects that we've already created so we can reuse them across multiple
     // GrVkPipelineStates
     SkTDynamicHash<GrVkSampler, uint16_t> fSamplers;