This is a completion of Hans's WIP patch:
https://codereview.chromium.org/1176133002/

Makes it possible for us to style text in fn2 apps.

The title style in the toolbar doesn't look quite right
but as far as I can tell its the same color as the
old typography code produced.  Will need further investigation.

Fixes #213

R=abarth@chromium.org, jackson@google.com

Review URL: https://codereview.chromium.org/1178913003.

Make Material actually create material, with opinions about what that
means.

Make FloatingActionButton use this.

Make Scrollable use this.

Make BoxDecoration support drawing a circle instead of a rectangle, so
that floating action button doesn't need a custom painter.

Implement RaisedButton (and remove button.dart, since there's no
"button" in Material Design).

Make InkWell have a "child" argument instead of "children", and not
have it introduce a Flex into the hierarchy.

Update container.dart example. Clean up some imports.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1179713004.

Make it possible to test that the stock app doesn't crash on startup and paints the basic scaffold more or less correctly.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1177043008.

I also removed the leading /, so it is now possible
to use shelldb start sky/sky_home to test.

Also fixed touch_demo.dart and sector layout to
work and not crash.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1177343002.

The back button now triggers an event of type |back|.

R=eseidel@chromium.org, jackson@chromium.org

Review URL: https://codereview.chromium.org/1176373004.

Also:
 - Make RenderProxyBox non-abstract
 - Upgrade the old container.dart example
 - Minor fixes to ui_mode.dart to make this work

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1183503003.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1184523002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1182563002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1175403002.

This moves input.dart to editing2/, since that way we can define the layering as strictly unidirectional.
It also reorders a bunch of imports to fit the style guide.
I removed the old remnants of the widgets example, and put the fn2 examples into the examples/widgets/ directory, to parallel the framework directory names.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1177243002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1179913002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1180873003.

This CL wires up the opacity of the popup menu items and teaches the popup menu
how to draw its background at the right size.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1175353002.

Sprite nodes use Point instead of Vector2

Updates sprite test app

Refactors accounting for pivot points in sprites

Adds abstract NodeWithSize class in Sprites.

Refactors SpriteNode to Sprite

Refactors TransformNode to Node (may need to find another name as it conflicts with Sky's Node).

Sprite system now uses and caches transformation matrices.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1180703002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1178783002.

Separate out the raw (directly manipulating sky.view) examples from the rendering (using RenderObject et al) examples.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1173233002

R=eseidel@chromium.org, eseidel

Review URL: https://codereview.chromium.org/1180623003

This lays the groundwork for using fn widgets in static environments.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1178703002

These are now called Block, Stack, and Flex, respectively. Less verbose.

R=jackson@google.com, ianh@google.com

Review URL: https://codereview.chromium.org/1181533002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1181453003

R=ianh@google.com

Review URL: https://codereview.chromium.org/1174153002.

Previously, they always started at the center of the RenderInkWell. Now we
remember the local coordinates we computed during the hit test and provide that
information when handling the event.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1180553002.

This also removes one bit of magic to make it more obvious what on is
going on during a sync, which should hopefully help.

Components have to decide if they support being stateful or not. If
they do, then they must implement syncFields() and have mutable
fields; if they don't, then they must have final fields. This isn't
particularly enforced, though.

This also renames _willSync() to _retainStatefulNodeIfPossible(), for
clarity, and fixes some minor style issues and one typo that was
breaking the drawer.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1174023003

Renders interactive_flex and stocks demos fine. Could use more testing,
so I'm going to work on that after I land this.

R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/1173493003

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1175763002.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1177563004.

This CL replaces the (non-working) components2 InkWell with some code based on
the ink_well example. There are at least two issues with the implementation:

1) The ink splash always starts at the center of the well because we don't have
   a facility for converting from global to local coordinates, which means we
   can't tell where the tap occurred in the local coordinates we need to use
   for painting.

2) When used inside a MenuItem, the in splash disappears shortly after
   starting, presumably because the button starts highlighting, which causes a
   component rebuild and somehow we lose the RenderInkWell instance.

I plan to address these issues in subsequent CLs.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1172033003.

StockRows are now a relatively simple application of flex layout.

The up/down arrows are now rendered within a circle, like
the original version. The arrows are a little bigger,
because.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1165223005.

This would cause them to forget what the most recent child they'd been given was, with disastrous effects later.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1173683003

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1166223004.

We already know how to talk to the network_service from Dart
via fetch.dart.  Might as well use that for Image loading
as well insetad of having ImageLoader do it.

As part of this I've renamed *ImageLoader to *ImageDecoder
and moved all the image loading logic into Dart.  This required
me to teach the idl system about mojo handles so that I could
pass the resulting MojoHandle from fetch.dart up through to
ImageDecoder.

R=abarth@chromium.org, jackson@google.com, hansmuller@google.com

Review URL: https://codereview.chromium.org/1173703002.

more ColorFilter types.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1163373007.

The FlexExpandingChild flex parameter is now a keyword as
well, which adds a small readability benefit.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1172503004.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1172723002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1169863002.

This CL pulled an implementation of position: absolute in RenderStackContainer.

R=eseidel@chromium.org, ianh@google.com

Review URL: https://codereview.chromium.org/1166363002.

This version doesn't add any visual punch.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1172513002.

This CL splits getIntrinsicDimensions into getMinIntrinsicWidth,
getMaxIntrinsicWidth, getMinIntrinsicHeight, and getMaxIntrinsicHeight so that
we can properly shrink-wrap the stocks app menu. This CL just contains the
refactoring. The use in stocks app will come in a later CL.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1167293003

Radians are the one true angle unit.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1164393002

Also change SizedBox.

This makes the code that uses Container() and SizedBox() much more readable.

The underlying RenderSizedBox is not affected by this change.

R=abarth@chromium.org, eseidel@chromium.org

Review URL: https://codereview.chromium.org/1166203002