Sketch new SkyView interface to the engine

sky/engine/public/sky/BUILD.gn

Index: sky/engine/public/sky/BUILD.gn
diff --git a/sky/engine/public/sky/BUILD.gn b/sky/engine/public/sky/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..872d2d3d8b196b83884677a0ea95ad6aa3321c7e
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+++ b/sky/engine/public/sky/BUILD.gn
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+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("sky") {
+  deps = [
+    "//skia",
+    "//sky/engine/core",
+    "//sky/engine/platform",
+  ]
+
+  configs += [
+    "//sky/engine:config",
+    "//sky/engine:inside_blink",
+    "//sky/engine:non_test_config",
+  ]
+
+  sources = [
+    "sky_display_metrics.h",
+    "sky_view.cc",
+    "sky_view.h",
+  ]
+}