Rename snapshot, other user-visible parts of docgen to dartdocgen.

BUG=
R=ricow@google.com

Review URL: https://codereview.chromium.org//696123005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41529 260f80e4-7a28-3924-810f-c04153c831b5
Use Element's source paths instead of URIs as a key in the index.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//703963002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41530 260f80e4-7a28-3924-810f-c04153c831b5
"Reverting 41529"

BUG=

Review URL: https://codereview.chromium.org//707503003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41531 260f80e4-7a28-3924-810f-c04153c831b5
AST-less implementation of DartDoubleClickSelector.

R=danrubel@google.com
BUG=

Review URL: https://codereview.chromium.org//708573002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41532 260f80e4-7a28-3924-810f-c04153c831b5
Fix old bug in VirtualMemory::Commit on Windows.

This was recently exposed by VerifiedMemory, which was the first time we commit something that's not the initial part of a reservation.

BUG=dart:21469
TBR=iposva@google.com

Review URL: https://codereview.chromium.org//701113004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41533 260f80e4-7a28-3924-810f-c04153c831b5