Use unnormalized coords all the way through with GL_TEXTURE_RECTANGLE textures.

We used to unnormalize them in the shader via SkSL.

This allows us to support GL_TEXTURE_RECTANGLE without having textureSize()
available in GLSL.

Change-Id: Ibe63a302228811933ef000251db4cad9aaf4f2ea
Reviewed-on: https://skia-review.googlesource.com/c/174068
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
13 files changed