Add an entry for image/avif to kPrimaryMappings

This allows us to display an AVIF image in the browser using the file:
URL.

Bug: 1071484
Change-Id: Iea6524f848a7e74b07005a0bedf2ea3a1320807f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153331Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#760137}

net/base/mime_util.cc

@@ -160,6 +160,7 @@ static const MimeInfo kPrimaryMappings[] = {
     {"audio/wav", "wav"},
     {"audio/webm", "webm"},
     {"audio/x-m4a", "m4a"},
+    {"image/avif", "avif"},
     {"image/gif", "gif"},
     {"image/jpeg", "jpeg,jpg"},
     {"image/png", "png"},
@@ -530,31 +531,30 @@ namespace {
 
 // From http://www.w3schools.com/media/media_mimeref.asp and
 // http://plugindoc.mozdev.org/winmime.php
-static const char* const kStandardImageTypes[] = {
-  "image/bmp",
-  "image/cis-cod",
-  "image/gif",
-  "image/ief",
-  "image/jpeg",
-  "image/webp",
-  "image/pict",
-  "image/pipeg",
-  "image/png",
-  "image/svg+xml",
-  "image/tiff",
-  "image/vnd.microsoft.icon",
-  "image/x-cmu-raster",
-  "image/x-cmx",
-  "image/x-icon",
-  "image/x-portable-anymap",
-  "image/x-portable-bitmap",
-  "image/x-portable-graymap",
-  "image/x-portable-pixmap",
-  "image/x-rgb",
-  "image/x-xbitmap",
-  "image/x-xpixmap",
-  "image/x-xwindowdump"
-};
+static const char* const kStandardImageTypes[] = {"image/avif",
+                                                  "image/bmp",
+                                                  "image/cis-cod",
+                                                  "image/gif",
+                                                  "image/ief",
+                                                  "image/jpeg",
+                                                  "image/webp",
+                                                  "image/pict",
+                                                  "image/pipeg",
+                                                  "image/png",
+                                                  "image/svg+xml",
+                                                  "image/tiff",
+                                                  "image/vnd.microsoft.icon",
+                                                  "image/x-cmu-raster",
+                                                  "image/x-cmx",
+                                                  "image/x-icon",
+                                                  "image/x-portable-anymap",
+                                                  "image/x-portable-bitmap",
+                                                  "image/x-portable-graymap",
+                                                  "image/x-portable-pixmap",
+                                                  "image/x-rgb",
+                                                  "image/x-xbitmap",
+                                                  "image/x-xpixmap",
+                                                  "image/x-xwindowdump"};
 static const char* const kStandardAudioTypes[] = {
   "audio/aac",
   "audio/aiff",

net/base/mime_util_unittest.cc

@@ -33,6 +33,7 @@ TEST(MimeUtilTest, ExtensionTest) {
     {FILE_PATH_LITERAL("js"), "text/javascript", true},
     {FILE_PATH_LITERAL("webm"), "video/webm", true},
     {FILE_PATH_LITERAL("weba"), "audio/webm", true},
+    {FILE_PATH_LITERAL("avif"), "image/avif", true},
 #if defined(OS_CHROMEOS)
     // These are test cases for testing platform mime types on Chrome OS.
     {FILE_PATH_LITERAL("epub"), "application/epub+zip", true},
@@ -309,6 +310,7 @@ TEST(MimeUtilTest, TestGetExtensionsForMimeType) {
       {"message/*", 1, "eml"},
       {"MeSsAge/*", 1, "eml"},
       {"message/", 0, nullptr, true},
+      {"image/avif", 1, "avif"},
       {"image/bmp", 1, "bmp"},
       {"video/*", 6, "mp4"},
       {"video/*", 6, "mpeg"},