Add canonical import paths.

freetype.go

@@ -6,7 +6,7 @@
 // The freetype package provides a convenient API to draw text onto an image.
 // Use the freetype/raster and freetype/truetype packages for lower level
 // control over rasterization and TrueType parsing.
-package freetype
+package freetype // import "github.com/golang/freetype"
 
 import (
 	"errors"

raster/raster.go

@@ -13,7 +13,7 @@
 // as the Freetype "smooth" module, and the Anti-Grain Geometry library.
 // A description of the area/coverage algorithm is at
 // http://projects.tuxee.net/cl-vectors/section-the-cl-aa-algorithm
-package raster
+package raster // import "github.com/golang/freetype/raster"
 
 import (
 	"strconv"

truetype/truetype.go

@@ -16,7 +16,7 @@
 //
 // To measure a TrueType font in ideal FUnit space, use scale equal to
 // font.FUnitsPerEm().
-package truetype
+package truetype // import "github.com/golang/freetype/truetype"
 
 import (
 	"fmt"