Copy shaders from WR repo.

resources/shaders/shared.glsl

@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//======================================================================================
+// Vertex shader attributes and uniforms
+//======================================================================================
+#ifdef WR_VERTEX_SHADER
+    #define varying out
+
+    // Uniform inputs
+	uniform mat4 uTransform;       // Orthographic projection
+  uniform float uDevicePixelRatio;
+
+    // Attribute inputs
+	in vec3 aPosition;
+#endif
+
+//======================================================================================
+// Fragment shader attributes and uniforms
+//======================================================================================
+#ifdef WR_FRAGMENT_SHADER
+    precision highp float;
+
+    #define varying in
+
+    // Uniform inputs
+    uniform sampler2D sDiffuse;
+    uniform sampler2D sMask;
+
+    // Fragment shader outputs
+    out vec4 oFragColor;
+#endif
+
+//======================================================================================
+// Interpolator definitions
+//======================================================================================
+
+//======================================================================================
+// VS only types and UBOs
+//======================================================================================
+
+//======================================================================================
+// VS only functions
+//======================================================================================