Manage known file paths set in FileSystemState.

Manage known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/db218ba2cf1f6226ae5d363ea6231f38ed25e0d5

[Brian Wilkerson, 2016-12-09 00:26:07]

lgtm

[scheglov, 2016-12-09 00:26:58]

Description was changed from

==========
Manager known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

to

==========
Manager known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

[scheglov, 2016-12-09 00:27:09]

Description was changed from

==========
Manager known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

to

==========
Manage known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

[scheglov, 2016-12-09 00:28:39]

Description was changed from

==========
Manage known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

to

==========
Manage known file paths set in FileSystemState.

This makes build type hierarchies another 14% faster.

R=brianwilkerson@google.com, paulberry@google.com
BUG=

Committed:
https://github.com/dart-lang/sdk/commit/db218ba2cf1f6226ae5d363ea6231f38ed25e0d5
==========

[scheglov, 2016-12-09 00:28:40]

Committed patchset #1 (id:1) manually as
db218ba2cf1f6226ae5d363ea6231f38ed25e0d5 (presubmit successful).