Support for json media types as (non-image) mime types.

LayoutTests/http/tests/inspector/network/async-xhr-json-mime-type-expected.txt

 CONSOLE MESSAGE: line 6: XHR loaded: 1
-Tests XHR network resource content for asynchronous requests with application/json mime type. Bug 80684
-
-http://127.0.0.1:8000/inspector/network/resources/json.php
-resource.type: xhr
-resource.content before requesting content: undefined
-resource.content after requesting content: {"number": "42"}
+CONSOLE MESSAGE: line 6: XHR loaded: 2
+Tests that the content of resources with JSON MIME types can be accessed.
+When loaded by asynchronous XHR requests (Bug 80684) or within iframes/documents.
 
 
+Running: test1
+request.url: http://127.0.0.1:8000/inspector/network/resources/json.php?type=application%2Fjson
+request.type: xhr
+request.mimeType: application/json
+request.content: {"number": "42"}
 
+request.url: http://127.0.0.1:8000/inspector/network/resources/json.php?type=application%2Fjson
+request.type: document
+request.mimeType: application/json
+request.content: {"number": "42"}
+
+
+Running: test2
+request.url: http://127.0.0.1:8000/inspector/network/resources/json.php?type=application%2Fvnd.document%2Bjson
+request.type: xhr
+request.mimeType: application/vnd.document+json
+request.content: {"number": "42"}
+
+request.url: http://127.0.0.1:8000/inspector/network/resources/json.php?type=application%2Fvnd.document%2Bjson
+request.type: document
+request.mimeType: application/vnd.document+json
+request.content: {"number": "42"}

[vsevik, 2013/12/16 10:01:19]

I am getting request.content: null in this line with the patch applied (Linux
release build).
Is it something that should be resolved by the chromium side patch?

[sof, 2013/12/16 10:35:32]

Yes, application/vnd.document+json won't be recognized as a supported text type
without it & won't be loaded in the iframe.

An unfortunate state of affairs, but I won't land that patch until this one is
ready.

+
+