Add layout tests to check Accept request header values observed by Service Worker

third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html
index 7b7947a0652930a572764aa609b46e85dca2985b..1ba4fe331a3495001fb66584de5fd1f487159d86 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-resources.html
@@ -8,6 +8,11 @@
 var url_count = 0;
 var expected_results = {};
 
+// The `Accept` header value for images should be
+// 'image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5' according to the spec
+// https://fetch.spec.whatwg.org/#fetching.
+var accept_image = 'image/webp,image/*,*/*;q=0.8';

[nhiroki, 2016/04/11 08:33:29]

If there is a bug about lack of the "q=0.5" part, can you add a link to that?

+
 function image_test(frame, url, cross_origin,
                     expected_mode, expected_credentials) {
   var actual_url = url + (++url_count);
@@ -15,6 +20,7 @@ function image_test(frame, url, cross_origin,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: accept_image,
       message: 'Image load (url:' +
                actual_url + ' cross_origin:' + cross_origin + ')'
     };
@@ -28,6 +34,7 @@ function script_test(frame, url, cross_origin,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: '*/*',
       message: 'Script load (url:' +
                actual_url + ' cross_origin:' + cross_origin + ')'
     };
@@ -41,6 +48,7 @@ function css_test(frame, url, cross_origin,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: 'text/css,*/*;q=0.1',
       message: 'CSS load (url:' +
                actual_url + ' cross_origin:' + cross_origin + ')'
     };
@@ -55,6 +63,7 @@ function font_face_test(frame, url, expected_mode,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: '*/*',
       message: 'FontFace load (url:' + actual_url + ')'
     };
   return frame.contentWindow.load_font(actual_url);
@@ -68,6 +77,7 @@ function css_image_test(frame, url, type,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: accept_image,
       message: 'CSSImage load (url:' + actual_url + ' type:' + type + ')'
     };
   return frame.contentWindow.load_css_image(actual_url, type);
@@ -81,6 +91,7 @@ function css_image_set_test(frame, url, type,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: accept_image,
       message: 'CSSImageSet load (url:' + actual_url + ' type:' + type + ')'
     };
   return frame.contentWindow.load_css_image_set(actual_url, type);
@@ -93,6 +104,7 @@ function fetch_test(frame, url, mode, credentials,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: '*/*',
       message: 'fetch (url:' + actual_url + ' mode:' + mode + ' credentials:' +
                credentials + ')'
     };
@@ -107,6 +119,7 @@ function audio_test(frame, url, cross_origin,
       mode: expected_mode,
       credentials: expected_credentials,
       redirect: 'follow',
+      accept: '*/*',
       message: 'Audio load (url:' + actual_url + ' cross_origin:' +
                cross_origin + ')'
     };
@@ -153,6 +166,10 @@ async_test(function(t) {
                     result.redirect, expected.redirect,
                     'redirect mode of ' + expected.message +  ' must be ' +
                     expected.redirect + '.');
+                assert_equals(
+                    result.accept, expected.accept,
+                    '`Accept` header value of ' + expected.message +  ' must be ' +

[nhiroki, 2016/04/11 08:33:29]

Can you wrap this line at 80th column?

+                    expected.accept + '.');
                 --url_count;
                 delete expected_results[result.url];
                 if (url_count == 0) {