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This is a part of implementation of class Uri. This CL contains
implementation of URI parser along with normalization and validation.
The file with unit tests was also included.
Other CLs:
 - https://crrev.com/c/2103143
 - https://crrev.com/c/2118426

BUG=chromium:821497
TEST=on my workstation

Change-Id: Ieb9f3c105d842d4cb2a8f2678d34130e3b94b374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2123640
Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761030}