A simple container for a TabBar. It is defined by a list of
TabNavigatorViews, each of which is just a TabLabel and
the tab's content.

The content of each tab is represented by a function
that produces a Widget called "content". I couldn't
bring myself to call it buildTabContentCallback or something
else more specific.

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

Review URL: https://codereview.chromium.org/1212993003.

This should be a perf win, but I haven't tested it.

Also adds an operator overloading such that Offset + Size -> Rect.
Also adds Rect.fromLTWH().

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1209413004.

Instead of having a one-off //sky/apk/stocks, we now use the |sky_app| GN
template to create Stocks.apk directly from //sky/sdk/example/stocks.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1211883004.

This library is logically part of //sky/viewer and shouldn't clutter up the
top-level //sky directory.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1213683004.

These benchmarks are very out-dated. In fact, they're still written in
JavaScript and mostly test the performance of the DOM.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1216823002.

* Remove all the DOM-based examples except for the old stocks app
* Rename stocks2 to stocks
* Promote hello_widgets.dart to a top-level hello_world example

TBR=ianh@google.com

Review URL: https://codereview.chromium.org/1219493003.

This CL builds an APK for MineDigger that works offline. We use |sky_packager|
to snapshot the Dart code, which we then extract from the APK during startup.
If we succeed in extracting a snapshot, we load it by default.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1211253004.

We're trying to follow the pattern described in https://www.dartlang.org/tools/pub/package-layout.html

TBR=iansf@google.com

Review URL: https://codereview.chromium.org/1210173004.

When both icons and text are specified, the icon goes on top,
10 pixels of margin goes in between, and the TabBar's height
grows to 72.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1213043002.

Added a OffsetBase class that Size now inherits from, and added a new
Offset class that also inherits from OffsetBase.

Offset has:
 - dx and dy members
 - zero and infinite static constants
 - a method that returns a new Offset that's the existing one scaled
   by a scalar
 - a unary minus operator
 - operators overloads such that subtracting or adding two Offsets
   gives another Offset
 - a toPoint() method

Added Offset and Size to the dart bindings, so they can be used from C++.

Changed the Canvas API to use Point, Size, and Offset where appropriate:
 - drawLine uses Points now
 - drawCircle uses a Point now
 - drawImage uses a Paint now
 - the constructor uses a Size

Changed Point as follows:
 - added a unary minus
 - Point difference now gives an Offset rather than a Size
 - You can add an Offset to a Point to get a new Point
 - toSize() has been replaced by toOffset()

Changed Rect as follows:
 - renamed upperLeft and lowerRight to topLeft and bottomRight for
   consistency with our other APIs
 - added bottomLeft and topRight for completeness

Changed Size as follows:
 - now inherits from OffsetBase
 - added *, /, ~/, and % operators for scaling sizes
 - subtracting a Size from a Size gives an Offset
 - subtracting an Offset from a Size gives a Size
 - changed the + operator to take an Offset instead of a Size
 - added topLeft, bottomLeft, topRight, bottomRight to match Rect
 - added center for the same reason
 - added shortestSide getter since that was a common pattern
 - removed toPoint()

Changed DrawLooperLayerInfo as follows:
 - setOffset member takes an Offset instead of a Point

Changed BoxConstraints as follows:
 - added biggest getter since it was a common pattern
 - added smallest getter for symmetry

Changed BoxShadow as follows:
 - offset member is an Offset rather than a Size

Changed ViewConstraints as follows:
 - replaced height and width members by a single size member

I did some minor code cleanup in nearby files while I was there,
including sorting sky/engine/core/core.gni alphabetically, and fixing
some warnings in the examples.

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

Review URL: https://codereview.chromium.org/1214833004.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1218593002.

It's a typo I introduced in https://codereview.chromium.org/1217533002

TBR=ianh

Review URL: https://codereview.chromium.org/1221473002.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1217533002.

Also added a smoke test for examples/widgets/tabs.dart.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1213873002.

- Rename animate() to watch().

- Fix Toggleable to actually be animated (previously, it was
  essentially luck that let it be animated -- it was piggy-backing on
  the splash, I think).

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1216533003.

TBR=abarth

Review URL: https://codereview.chromium.org/1208293002.

Let's hide double.INFINITY a bit more, by providing cleaner APIs for the cases where we're currently trying to use it.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1209233002.

Add a note about sizedByParent's use. One day we should audit our RenderBoxes and see if any of them can have it set; currently only Scaffold uses it.

TBR=abarth

Review URL: https://codereview.chromium.org/1216533002.

Unbreak support for snapshots now that we have our offline Dart loader. Also,
wire up support for snapshots in sky_shell on Linux.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1212623002.

New asserts:
- verify that after layout, the size fits the constraints
- verify that after layout, the size isn't infinite
- verify that you don't set the size in performLayout() if you have
  sizedByParent set
- verify that nobody reads your size during layout except you, or your
  parent if they said parentUsesSize:true

Fixes some bugs found by those asserts:
- RenderBlock, RenderStack, and RenderScaffold were not always setting
  parentUsesSize correctly
- RenderScaffold was setting its slot entries to null rather than
  removing them when the slot went away, which led to null derefs in
  certain circumstances

Also, rename a local variable in RenderStack.performLayout() because
it was shadowing a variable on the object itself, which was really
confusing when I first tried to debug this function...

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1213473003.

TBR=abarth

Review URL: https://codereview.chromium.org/1204373003.

There's is no support for animating the selected tab indicator, there isn't a TabNavigator container yet, overflow layout (tabs don't fit) isn't supported yet, etc.

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

Review URL: https://codereview.chromium.org/1205953002.

This CL makes it possible to run Sky apps offline by introducing new
DartLibraryProvider subclasses, specifically one that can load directly from
the file system. A future CL will expand this functionality to work with asset
bundles as well.

Currently, the only platform that uses this functionality is Linux, which can
now load a simple Sky app without even loading a network stack. Making this
work on other platforms is work for future CLs.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1203143004.

R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/1206373002.

Adds documentation to Texture and SpriteSheet

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1212073002.

TBR=collin,hansmuller

Review URL: https://codereview.chromium.org/1211573003.

Give rationale for style guide, suggest using more concise code when doing so doesn't harm readability.
TBR=abarth

Review URL: https://codereview.chromium.org/1209003002.

Win was not being detected.

BUG=none
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1209823002.

This also fixes the C++ side to give the right baseline information.
Previously it was giving the baseline distance for the font, but not
for the actual laid-out text.

I considered also providing a "defaultBaseline" accessor that returns
the distance for the actual dominant baseline, but it turns out right
now we never decide the baseline is ideographic. We always use the
alphabetic baseline. We should probably fix that...

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1200233002.

WorkerPools can't be shut down, which means that the app's .so can't be
unloaded (which is bad for single process mode, and which is probably
why the asset bundle tests are flakily crashing on the try bots).

So use a SequencedWorkerPool instead (even though we don't care about
sequencing).

R=eseidel@chromium.org, kulakowski@chromium.org, abarth@chromium.org
BUG=Fixes #268

Review URL: https://codereview.chromium.org/1206673006.

-replace UINode for Widget
-add the minedigger demo
-fix spelling of astroids

BUG=none
R=eseidel@chromium.org, ianh@google.com

Review URL: https://codereview.chromium.org/1203923006.

Also, some minor cleanup in TextStyle to make it more readable.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1203253002.

R=eseidel@chromium.org, eseidel

Review URL: https://codereview.chromium.org/1210653002.

TBR=iansf

Review URL: https://codereview.chromium.org/1201383005.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1208483002.

Decouple Canvas from DisplayList and map Picture and PictureRecorder more directly to their Skia counterparts.

Also changes the framework dart code to use the
refactored APIs and fixes the various examples and
tests.

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

Review URL: https://codereview.chromium.org/1190123003.

This CL factors the network interactions out of DartLoader into a
DartLibraryProvider interface, paving the way for other library providers
(e.g., offline).

As part of this CL, I've renamed DartLoader to DartLibraryLoader and moved the
class into tonic, where it can't have any direct network dependencies.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1202283004.

This CL generated by |sed -i '/sky\/engine\/config.h/d'| and a manual sweep to
catch some oddballs.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1206763002.

This CL removes all the content from config.h. It doesn't actually delete the
file. I'll make that change in a separate CL.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1205793002.