Fix WebGL signatures.

Author: mseddon

src/main/scala/org/scalajs/dom/raw/WebGL.scala

@@ -1541,7 +1541,7 @@ class WebGLRenderingContext extends js.Object {
  /**
  * Specifies the line width.
  */
- def lineWidth(width: Int): Unit = js.native
+ def lineWidth(width: Double): Unit = js.native
 
  /**
  * Attempts to link the specified [[WebGLProgram]].
@@ -1562,7 +1562,7 @@ class WebGLRenderingContext extends js.Object {
  * to them, calculated as `factor`*DZ + r*`units`, where DZ is the change in z based on the polygon's screen area, and r is the minimum value that
  * is guaranteed produce a measurable offset.
  */
- def polygonOffset(factor: Int, units: Int): Unit = js.native
+ def polygonOffset(factor: Double, units: Double): Unit = js.native
 
  /**
  * Reads pixels from the framebuffer into `pixels`.
@@ -1757,7 +1757,7 @@ class WebGLRenderingContext extends js.Object {
  * [[WebGLRenderingContext.TEXTURE_WRAP_S]], or [[WebGLRenderingContext.TEXTURE_WRAP_T]]
  * @param param the value to set. See the corresponding parameters for valid values.
  */
- def texParameterf(target: Int, pname: Int, param: Int): Unit = js.native
+ def texParameterf(target: Int, pname: Int, param: Double): Unit = js.native
 
  /**
  * Sets the texture parameter for the active texture unit.