Transformer GL: Apply transformation_matrix to vertex position.

Previously, transformation_matrix was incorrectly applied to
texture sampling coordinates, which led to transformations
seemingly moving in the opposite position, and an undesirable
GL_CLAMP_TO_EDGE behavior when sampling outside the edge of
the texture.

PiperOrigin-RevId: 413653360

libraries/transformer/src/main/assets/shaders/vertex_shader.glsl

@@ -17,6 +17,6 @@ uniform mat4 tex_transform;
 uniform mat4 transformation_matrix;
 varying vec2 v_texcoord;
 void main() {
-  gl_Position = a_position;
-  v_texcoord = (transformation_matrix * tex_transform * a_texcoord).xy;
+  gl_Position = transformation_matrix * a_position;
+  v_texcoord = (tex_transform * a_texcoord).xy;
 }