[telemetry] Support absolute paths by changing file:/// to file://. More robust file path handling.

[telemetry] Support absolute paths by changing file:/// to file://. More robust file path handling.

file:///a/b/c.html == absolute path. This follows RFC-1738 (empty hostname refers to localhost).
file://a/b/c.html == relative path. In the RFC, "a" is technically the hostname, but we're just gonna use it as part of the path.

http_server:
- Support relative paths at the command-line for memory_cache_http_server.
- Removal of duplicate paths.
- Correct path prefix calculation. (commonprefix is a string prefix, not a path prefix.)
- Correct UrlOf so it works based on path, not on an assumption that serving_dirs_and_file returns a specific value.

page:
- Remove _UrlPathJoin. Its behavior is awkward for absolute paths. Its backslash to slash conversion should be unnecessary if we always use proper OS paths (except in UrlOf).
- Split serving_dirs_and_file into page.file_path, page.serving_dir, and page_set.serving_dirs.


BUG=None.
TEST=tools/telemetry/run_tests; tools/perf/run_tests; tools/perf/run_measurement blink_perf_all; tools/perf/run_benchmark sunspider; content/test/gpu/run_gpu_test webgl_conformance

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=228869

[Ken Russell (switch to Gerrit), 2013-10-08 22:47:33]

content/test/gpu LGTM assuming the test expectations still apply correctly with
these changes.

[tonyg, 2013-10-10 00:45:02]

lgtm

I'm super excited to see that UrlPathJoin badness go away.

[commit-bot: I haz the power, 2013-10-11 20:31:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dtu@chromium.org/24451002/84001

[commit-bot: I haz the power, 2013-10-11 23:08:53]

Retried try job too often on mac_rel for step(s) telemetry_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-10-14 22:20:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dtu@chromium.org/24451002/125001

[commit-bot: I haz the power, 2013-10-14 23:43:10]

Retried try job too often on mac_rel for step(s) telemetry_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-10-16 00:57:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dtu@chromium.org/24451002/152001

[commit-bot: I haz the power, 2013-10-16 05:47:40]

Change committed as 228869