Add command buffer submits before copy calls in vulkan.

src/gpu/vk/GrVkCaps.cpp

Index: src/gpu/vk/GrVkCaps.cpp
diff --git a/src/gpu/vk/GrVkCaps.cpp b/src/gpu/vk/GrVkCaps.cpp
index 7669ba541a9d94513889d5296f266713cffcc98e..e72e723dd6219b06544b4dc419383ae66e6f7ffc 100644
--- a/src/gpu/vk/GrVkCaps.cpp
+++ b/src/gpu/vk/GrVkCaps.cpp
@@ -19,6 +19,7 @@ GrVkCaps::GrVkCaps(const GrContextOptions& contextOptions, const GrVkInterface*
     fMustDoCopiesFromOrigin = false;
     fAllowInitializationErrorOnTearDown = false;
     fSupportsCopiesAsDraws = false;
+    fMustSubmitCommandsBeforeCopyOp = false;
 
     /**************************************************************************
     * GrDrawTargetCaps fields
@@ -74,6 +75,11 @@ void GrVkCaps::init(const GrContextOptions& contextOptions, const GrVkInterface*
         fAllowInitializationErrorOnTearDown = true;
     }
 
+    if (kNvidia_VkVendor == properties.vendorID) {
+        fSupportsCopiesAsDraws = true;
+        fMustSubmitCommandsBeforeCopyOp = true;
+    }
+
     this->applyOptionsOverrides(contextOptions);
     GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(fShaderCaps.get());
     glslCaps->applyOptionsOverrides(contextOptions);