[core] Add `line-gradient` property

Porting of https://github.com/mapbox/mapbox-gl-js/pull/6303
See the link above for the description of the feature and
its limitations).

Based on patch from @lbud (Lauren Budorick).

1 files changed, 16 insertions, 0 deletions

diff --git a/src/mbgl/shaders/line_gradient.hpp b/src/mbgl/shaders/line_gradient.hpp
new file mode 100644
index 0000000000..87a9d6d38c
--- /dev/null
+++ b/src/mbgl/shaders/line_gradient.hpp
@@ -0,0 +1,16 @@
+// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
+
+#pragma once
+
+namespace mbgl {
+namespace shaders {
+
+class line_gradient {
+public:
+    static const char* name;
+    static const char* vertexSource;
+    static const char* fragmentSource;
+};
+
+} // namespace shaders
+} // namespace mbgl