Tests that cache data is correctly populated in the Inspector.

Dumping CacheStorage tree:
    (empty)
Dumping CacheStorage tree:
    cache: testCache1 - http://127.0.0.1:8000/
        (cache empty)
    cache: testCache2 - http://127.0.0.1:8000/
        (cache empty)
    cache: testCache3 - http://127.0.0.1:8000/
        (cache empty)
Dumping CacheStorage tree:
    cache: testCache1 - http://127.0.0.1:8000/
        0, /1, default, text/plain, 0
        1, /2, default, text/plain, 0
        2, /T, default, image/png, 0
        totalCount: 3
    cache: testCache2 - http://127.0.0.1:8000/
        0, /1, default, text/plain, 0
        1, /2?query=19940123, default, text/plain, 0
        2, /H/22, default, text/plain, 0
        3, /L/11, default, text/plain, 0
        4, /T, default, text/javascript, 0
        totalCount: 5
    cache: testCache3 - http://127.0.0.1:8000/
        0, /devtools/resources/image.png, basic, image/png, 647
        1, /vars, default, text/plain, 0, Accept
        totalCount: 2
Dumping CacheStorage tree with URL path filter string "2"
    cache: testCache1 - http://127.0.0.1:8000/
        0, /2, default, text/plain, 0
        totalCount: 1
    cache: testCache2 - http://127.0.0.1:8000/
        0, /2?query=19940123, default, text/plain, 0
        1, /H/22, default, text/plain, 0
        totalCount: 2
    cache: testCache3 - http://127.0.0.1:8000/
        (no matching entries)
Dumping CacheStorage tree with URL path filter string "image"
    cache: testCache1 - http://127.0.0.1:8000/
        (no matching entries)
    cache: testCache2 - http://127.0.0.1:8000/
        (no matching entries)
    cache: testCache3 - http://127.0.0.1:8000/
        0, /devtools/resources/image.png, basic, image/png, 647
        totalCount: 1
Dumping testCache2's entry with request URL: http://fake.request.com/1
        Y
Dumping testCache3's entry with request URL: http://fake.request.com/vars
    the original request has headers; query with headers? true
        Z
Dumping testCache3's entry with request URL: http://fake.request.com/vars
    the original request has headers; query with headers? false
        (nothing to preview)