Add very basic webgl vector renderer

src/ol/renderer/webgl/webglvectorlayer.glsl

@@ -0,0 +1,23 @@
+//! NAMESPACE=ol.renderer.webgl.vectorlayer.shader
+//! CLASS=ol.renderer.webgl.vectorlayer.shader.
+
+
+//! COMMON
+
+
+//! VERTEX
+attribute vec2 a_position;
+
+uniform mat4 u_projectionMatrix;
+
+void main(void) {
+  gl_PointSize = 10.0;
+  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.);
+}
+
+
+//! FRAGMENT
+
+void main(void) {
+  gl_FragColor = vec4(1.0, 1.0, 0.0, 0.7);
+}