Track overflow during flex layout and fix stocks row

R=hixie

Rebaseline stocks test to account for transitions

Remove editing code from the C++ side of Sky.

Also, turn on testing in Travis.

Fix build issues related to symlink.py

There are actually two uses cases for symlink.py. This CL restores
//build/symlink.py to match the version in Chromium and adds a new version in
////sky/build/symlink.py that works properly for the material-design-icons.

Fix #57 Flex needs to understand baselines

This removes the bulk of core/editing/*.
The following files remain, because they might be useful yet:
  EditingBoundary.h
  FindOptions.h
  htmlediting.cpp
  htmlediting.h
  PlainTextRange.cpp
  PlainTextRange.h
  PositionWithAffinity.cpp
  PositionWithAffinity.h
  RenderedPosition.cpp
  RenderedPosition.h
  TextAffinity.h
  TextGranularity.h
  TextIterator.cpp
  TextIterator.h
  VisiblePosition.cpp
  VisiblePosition.h
  VisibleSelection.cpp
  VisibleSelection.h
  VisibleUnits.cpp
  VisibleUnits.h

In addition to remove obviously editing-related stuff like
"ApplyBlockElementCommand.cpp" and "InsertLineBreakCommand.cpp", this
also removes the DOM side of selection, all the caret management and
painting code, composition support (IME) including the relevant
events, spelling checker support, and the undo stack.

Outside the core/editing/* directory, I also deleted the EditorClient,
SpellCheckerClient, and EmptyClients classes. The other changes
outside of editing/ are mostly just about removing mentions of the
selection or carets.

I tried to leave the code for _painting_ selections and composition
runs, though that code is mostly disconnected now.

Add another missing dependency

The idea is that AnimatedContainer is a drop-in replacement for Container that
provides implicit animations when its properties change.

R=mpcomplete@google.com

Attempt to make Travis green

Add a build status badge to README.md

R=abarth

Navigator improvements, avoid building invisible routes

R=abarth

Fix issue #34 Clicking on "Autorefresh" menu item does not click checkbox

R=abarth

Fix history collisions

R=abarth

Add basic travis integration

Update Chromium to 9659b08ea5a34f889dc4166217f438095ddc10d2

- Add missing dependencies caught by gn's new stricter checker
- Update opentype code to use new OTS API. This code is updated from HEAD
  Blink.
- Add base dependency to wtf to avoid redefining marcos from base/macros.h
- Update callers of various base string utility functions to use base
  namespace.

This change matches what GYP does.

R=brettw@chromium.org