gopls: migrate internal/lsp to gopls/internal/lsp

This CL was created using the following commands:

    ./gopls/internal/migrate.sh
    git add .
    git codereview gofmt

For golang/go#54509

Change-Id: Iceeec602748a5e6f609c3ceda8d19157e5c94009
Reviewed-on: https://go-review.googlesource.com/c/tools/+/426796
gopls-CI: kokoro <noreply+kokoro@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Peter Weinberger <pjw@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/internal/diff/myers/diff_test.go b/internal/diff/myers/diff_test.go
new file mode 100644
index 0000000..f244455
--- /dev/null
+++ b/internal/diff/myers/diff_test.go
@@ -0,0 +1,16 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package myers_test
+
+import (
+	"testing"
+
+	"golang.org/x/tools/internal/diff/difftest"
+	"golang.org/x/tools/internal/diff/myers"
+)
+
+func TestDiff(t *testing.T) {
+	difftest.DiffTest(t, myers.ComputeEdits)
+}