image: Inline example image data to make it runnable on playground.

Use more compressed image to reduce source clutter.

Fixes #5983.

R=nigeltao, adg
CC=golang-dev
https://golang.org/cl/12513044

src/pkg/image/decode_example_test.go

@@ -6,10 +6,11 @@
 package image_test
 
 import (
+	"encoding/base64"
 	"fmt"
 	"image"
 	"log"
-	"os"
+	"strings"
 
 	// Package image/jpeg is not used explicitly in the code below,
 	// but is imported for its initialization side-effect, which allows
@@ -21,15 +22,15 @@ import (
 )
 
 func Example() {
-	// Open the file.
-	file, err := os.Open("testdata/video-001.jpeg")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer file.Close()
-
-	// Decode the image.
-	m, _, err := image.Decode(file)
+	// Decode the JPEG data. If reading from file, create a reader with
+	//
+	// reader, err := os.Open("testdata/video-001.q50.420.jpeg")
+	// if err != nil {
+	//     log.Fatal(err)
+	// }
+	// defer reader.Close()
+	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))
+	m, _, err := image.Decode(reader)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -60,20 +61,80 @@ func Example() {
 	}
 	// Output:
 	// bin               red  green   blue  alpha
-	// 0x0000-0x0fff:    471    819   7596      0
-	// 0x1000-0x1fff:    576   2892    726      0
-	// 0x2000-0x2fff:   1038   2330    943      0
-	// 0x3000-0x3fff:    883   2321   1014      0
-	// 0x4000-0x4fff:    501   1295    525      0
-	// 0x5000-0x5fff:    302    962    242      0
-	// 0x6000-0x6fff:    219    358    150      0
-	// 0x7000-0x7fff:    352    281    192      0
-	// 0x8000-0x8fff:   3688    216    246      0
-	// 0x9000-0x9fff:   2277    237    283      0
-	// 0xa000-0xafff:    971    254    357      0
-	// 0xb000-0xbfff:    317    306    429      0
-	// 0xc000-0xcfff:    203    402    401      0
-	// 0xd000-0xdfff:    256    394    241      0
-	// 0xe000-0xefff:    378    343    173      0
-	// 0xf000-0xffff:   3018   2040   1932  15450
+	// 0x0000-0x0fff:    353    759   7228      0
+	// 0x1000-0x1fff:    629   2944   1036      0
+	// 0x2000-0x2fff:   1075   2319    984      0
+	// 0x3000-0x3fff:    838   2291    988      0
+	// 0x4000-0x4fff:    540   1302    542      0
+	// 0x5000-0x5fff:    319    971    263      0
+	// 0x6000-0x6fff:    316    377    178      0
+	// 0x7000-0x7fff:    581    280    216      0
+	// 0x8000-0x8fff:   3457    228    274      0
+	// 0x9000-0x9fff:   2294    237    334      0
+	// 0xa000-0xafff:    938    283    370      0
+	// 0xb000-0xbfff:    322    338    401      0
+	// 0xc000-0xcfff:    229    386    295      0
+	// 0xd000-0xdfff:    263    416    281      0
+	// 0xe000-0xefff:    538    433    312      0
+	// 0xf000-0xffff:   2758   1886   1748  15450
 }
+
+const data = `
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