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.

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.

This factoring will more code use BoxPainter in the future (in particular,
PopupMenu).

R=ianh@google.com

Review URL: https://codereview.chromium.org/1180633004.

The final animation is more involved, but this CL starts implementing the menu
animation by making it fade in.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1174253003.

R=abarth@chromium.org

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

R=abarth@chromium.org, abarth, hansmuller

Review URL: https://codereview.chromium.org/1181533003

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

Review URL: https://codereview.chromium.org/1174203002

R=abarth@chromium.org, hixie

Review URL: https://codereview.chromium.org/1181523002

R=abarth@chromium.org

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

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.

R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/1176053002

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.

 - constructors first
 - have either a blank line at the top and bottom of each class, or no blank line in either place (it's still inconsistent about which we should do)
 - hide clamp()

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1172173002

TBR=abarth

Review URL: https://codereview.chromium.org/1173783002

Instead of triggering layout synchronously during AppView construction, we now
schedule the initial layout using a magic bootstrapping function.

TBR=ianh@google.com

Review URL: https://codereview.chromium.org/1172123003.

This CL implements a basic version of screen rotation where we just relayout at
the new size. In the future, we'll want a fancy version where we transition
between the two layouts.

R=ianh@google.com
BUG=

Review URL: https://codereview.chromium.org/1177563002.

Add asserts to prevent people from setting box.parentData.position or box.size except during layout.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1176623002

Also added a helper class to Sky framework for building shadow DrawLoopers.

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

Review URL: https://codereview.chromium.org/1175683002.

This matches the material design spec.

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

Review URL: https://codereview.chromium.org/1169873003.

TBR=ianh@google.com

Review URL: https://codereview.chromium.org/1174623002.

R=eseidel@chromium.org

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

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

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

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

The popup menu in the stocks app is supposed to size its width to the max
intrinsic width of the menu. This CL teaches it how to do that.

It's a shame that we need to ceilToDouble the output of RenderParagraph. If we
don't do that, we run into floating point layout trouble and the menu triggers
a line break. The correct fix is to do layout in fixed point.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1168113005

I don't think this is the final API we're going to use.

I suspect we'll add a TextStyle struct to hold
color and size, etc. which back-ends into CSS like
this does today.

Currently no one uses this color even though it exists.

This is one step towards fixing:
https://github.com/domokit/mojo/issues/213

R=ianh@google.com

Review URL: https://codereview.chromium.org/1162573007

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

R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/1164363002

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

Review URL: https://codereview.chromium.org/1166183002

This CL is the first step towards getting PopupMenuItem working in fn2. We
introduce the ability to add a minWidth to a Container by creating a
RenderConstrainedBox class to apply the new constraints.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1155683011

And deploy it in a few places.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1164303002

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1156383006

We were hitting an assert in RenderCustomPaint that the callback wasn't null.

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

Review URL: https://codereview.chromium.org/1162023010

Export Point, Size, Rect, Color, Paint, Path, BoxDecoration, Border, BorderSide, EdgeDims, and FlexDirection from fn2.dart
That way most of our libraries don't have to use sky.Foo all over the place, and we can reduce the number of imports in most Dart components.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1161323004

The + isn't quite centered properly, but the button is a circle in the right
place.

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

Review URL: https://codereview.chromium.org/1156383004

 - several places where we use a getter knowing that it will return a
   subclass of its declared type, even asserting that it does, but
   where the analyzer is worried that the getter might start returning
   a new value unexpectedly, solved by having a temporary local
   variable shadow the getter and asserting that it doesn't change
   value
 - many many places where we do this with parentData specifically,
   solved by type-erasing parentData.
 - a place where a mixin wants to be subclassing another class, and
   uses its methods, solved by saying that the mixin is abstract but
   implements the superclass

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1160923008

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

Review URL: https://codereview.chromium.org/1157573012

Rename "BorderSide.None" to "BorderSide.none", since it's a constant, and change the sky.Size.infinite() constructor to a constant.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1158263005

Include DETACHED, NEEDS-LAYOUT, and relayoutSubtreeRoot info in the debug output for the render tree

R=chinmaygarde@google.com

Review URL: https://codereview.chromium.org/1149083011

Improve the RenderObject.toString() logic so that there's not blank lines everywhere and to generally be better.
Adds sizes, positions, transforms, improves RenderParagraph's output.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1160233004

The goal of this is to have a Renderer-layer abstraction
around the Sky Engine c++ apis for drawing a shadow.

R=mpcomplete@chromium.org

Review URL: https://codereview.chromium.org/1146893004