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, abarth, hansmuller

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

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.

Tweaked the layout in Scaffold a little: the Scaffold
accounts for the (Android) notification bar's height,
instead of the ToolBar. I think it would be best if
moving the app below the notification area were handled
at a lower level. Doing it in Scaffold seemed OK for the
moment, since one could put a ToolBar component anywhere
in an app.

Closes #208

R=ianh@google.com

Review URL: https://codereview.chromium.org/1171173003.

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

 - 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

Also, I've fixed the mask color on the drawer.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1168203004.

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

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

https://www.dartlang.org/articles/style-guide/#names

R=jackson@google.com

Review URL: https://codereview.chromium.org/1158813004

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

Review URL: https://codereview.chromium.org/1165983002

Also, make the scaffold code more generic (with slots in a map,
instead of dedicated members for each slot).

This may eventually benefit from being split into a general
"multislot" superclass and a scaffold-specific subclass, but for now
it'll do.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1152163007

Also add operator==, hashCode, toString, and some basic Color constants to
Color.

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

Review URL: https://codereview.chromium.org/1162023004

Looks horrible.  But it's a start.

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

Review URL: https://codereview.chromium.org/1146913005

Previously layout2.dart was a thousand lines long.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1161003002

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

Review URL: https://codereview.chromium.org/1165463002

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1153223003

Eventually this'll be merged back into components/, but we want to keep both running for now.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1158713007

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1133353008

Revert "Add library names to many sky libraries"

This reverts commit 1337e0a803a54ee92d6dce7f8c4a6335f7cbb9fa.

BUG=
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1142893007

- Analyzer complains about libraries not having names. This adds names to many libraries.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1150433002

NOTE: This CL appears far larger than it actually is for two reasons:

1) Many files were moved around to use the Dart package directory structure.
2) Many .dart files had to have import paths updated.

- Organize mojo/public/dart so that it uses standard Dart package layout
- Organize mojo/dart/apptest so that it uses a standard Dart package layout
- Organize sky/sdk so that it uses a standard Dart package layout
- Create a mojo/testing package (used by unittests)
- Introduce the 'dart_pkg' gn rule which populates gen/Config/dart-pkg
- All internally vended Dart packages must have a corresponding dart_pkg rule
- It is now possible to use dependency_overrides: in pubspec.yaml to mix internal and external package dependencies (enables analyzer, editor, webstorm usage for internal developers).
- Package root for dart content handler ends with "packages/"
- Imports of mojo package uris no longer need the "public/dart"
- mojo/public/tools/dart_package.py is a clone of mojo/public/tools/gn/zip.py
- Sky tests no longer run 'deploy_sdk' script.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1132063007

This introduces a new kind of ContentNode similar to Style but which
instead of changing the styles that apply to the node, provides new
settings to apply to the "parentData" structure.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1122413006

This reverts commit 1a4db2e964de8a2eba7c76c0904027150cc0c387.

This broke the bots.

TBR=github.com@spam.hixie.ch

Review URL: https://codereview.chromium.org/1137153002

This introduces a new kind of ContentNode similar to Style but which
instead of changing the styles that apply to the node, provides new
settings to apply to the "parentData" structure.

If you have better ideas for the class names here let me know.

Note that the layout.dart backend of this is hacky (more so than
before, even); once we have something other than the DOM and CSS to
back it, it'll get rewritten.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1129893006

FlexContainer is a (pretend) new layout primitive that implements Flex layout.
It's only pretend because right now it's still just backed by CSS.
This is a step along the way to removing all the CSS from fn.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1128743003

Analyzer was complaining about '-' not being an allowed character
in dart file names.

R=jamesr@chromium.org

-Make display:flex, flex-direction: column, flex-shrink: 1 the default.
-Simplify StyleAdjuster::adjustStyleForAlignment to remove special cases we
won't need as we make flex the default and remove absolute positioning.
-Fix a bug this exposed in column flexboxes where we'd apply the wrong edge
of border/padding/margin.
-For now leave the default of align-items:stretch. The main change here is
that iframe/img will do width:auto the same as blocks (i.e. the width of
the parent). I think this is a good change, but we'll have to see how it feels
in practice.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1061163002

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1043283003

Most of the elements that want to be Material (i.e., have a level and cast a
shadow) don't want to be InkWells (i.e., have an ink splash effect). This CL
disentangles these two components, fixing bugs in the Drawer and in the
PopupMenu. Separating these concepts also lets us use Material for the
ActionBar and the FloatingActionButton.

R=rafaelw@chromium.org

Review URL: https://codereview.chromium.org/1037673002

This CL uses CSS transition to add an implicit animation between purple
ActionBar and the light grey "search" action bar. It's unclear to me how best
to create implicit animations in this system, but using a CSS transition works
surprisingly well.

Also, fix the typography style for the placeholder in the search box.
Previously it was white on Grey[50], which was extremely hard to see.

R=rafaelw@chromium.org

Review URL: https://codereview.chromium.org/1036783002

This CL cleans up stock_app.dart to better separate concerns now that we have
StyleNode. Also, this CL introduces IconButton, which will grow to include an
ink effect in the future, and makes the background of the search bar white.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/1007893005

This CL adds typography information to the Sky theme. The values are from the
Material Design spec. I've also applied these values to the stocks app and the
various components.

We're not geting precisely the right typography in some cases because of
https://github.com/domokit/mojo/issues/65.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1006363004

The left edge of the title should be on the 72px vertical keyline according to
the Material Design spec.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1010443005

This naming matches the naming in Material Design.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1010913002

This CL lets Sky apps draw behind the Android status bar, better matching the
material design spec.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1010493007

This CL makes the drawer the correct size and use the correct animation curve.
Also, remove the hard-coded z-index values now that hit testing works again.
This CL adjusts the mask's opacity to match the drawer in Gmail.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1012463003

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1006053002

To accomplish this, I made the following changes:

1) Material is now in charge of drawing the material shadows.
2) In order to mix in the style for the shadow, Element now takes a list of
   Styles instead of a single style.
3) Update all clients of Element#style to understand that we now have a list.
4) Update components that drawer shadows to have Material do that work instead.
   a) One exception: FloatingActionButton draws its own shadow because of its
      crazy clip requirements. We'll probably want to find a better way for
      FloatingActionButton to clip in the future.

I've also added a widgets-fn example to demo the fn material widgets.

This CL introduces a bug into Drawer whereby you can get ink splashes
everywhere in the drawer. In the future, we'll need to separate out the
different material aspects to get non-splashable materials.

R=rafaelw@chromium.org

Review URL: https://codereview.chromium.org/1003553002

Moving these files into sky/framework will make them easier to use from the
SDK. Also, this CL also splits up the giant "widgets" library into smaller
libraries, one per component.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/993033003