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Fix chrome://flags behaviour for bfcache flag forcing caching:
- Ensure that all parameters are correctly captured
- Rename the mode to "Force caching all pages" to be more clear
- Extend timeout to 1 hour for easier testing.

R=carlscab@google.com

Change-Id: I7df177abccea0fa849a5834c13b75464553c5cfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919759
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#715897}