Instead, make Layer::Paint take a new PaintContext that has just exactly
the state that it needs, mirroring PrerollContext. Also, rename
PaintContext to CompositorContext because it holds the context for the
whole compositor.

Particularly, add support for blur filters to implement backdrop blur effects.

Previously we just dropped child scenes on the floor. Now we upload them
to Mozart. However, we just draw them on top of all the other content
and don't apply any clips or blends.

This patch contains Dart bindings for adding a child scene when running in
Mozart. The child scene is currently ignored, but a later patch will actually
incoporate it into the tree.

Now that the compositor doesn't have any tricky deps, we can make it a
top-level project, which saves a bunch of typing.

Now we just depend on Skia and Base, which makes the compositor easier
to understand.

Also, update our skia/ext/refptr.h to match the current version of the
code in Chromium. This version adds support for several useful C++11
patterns.

The shader is supposed to be drawn on top of the children as a mask. The
previous drawing code was incorrect.

We need this to implement RenderShaderMask properly. See #1155.

Also, remove compositor_options in favour of four int constants, four
bitwise ands, and a few zero-equality comparisons, since it doesn't
seem we'll need this to scale much after all.

This patch adds back (and tweaks) some code that we previously removed
for caching rasterized layers. Now that our layerization code in the
framework is more sophisticated, we should be able to get more value out
of this mechanism.

dont mutate from frame to frame

Instead of squashing the layers down into a single SkPicture, we now pass the
tree to the GPU thread, which draws everything separately.

We now build a layer tree before squashing the draw command down to an
SkPicture.

We don't use this interface yet.

Now that we have all the Dart packages we need in //third_party, we can build
skyx bundles by default.

As part of this change, I've made it possible to build skyx bundles on Linux
and I've made the gn target names of the mojoms in //sky/services consistent
with each other and with //mojo/services/public.

TBR=eseidel@google.com

Review URL: https://codereview.chromium.org/1227973002 .

The term ViewportObserver doesn't mean anything. This interface has evolved to
control the engine. This new name reflects that.

TBR=eseidel@google.com

Review URL: https://codereview.chromium.org/1222663003.

We still don't quite handle multitouch correctly, but single touches work now.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/932283002

Sky Inspector is currently not working. This patch removes the Inspector
server, which is based on net/http_server, to unblock dropping /net in
Mojo.

BUG=456130
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/931873002

Since we don't support using the component build to produce mojo apps,
we can simplify the build targets in a few ways:

*) every mojo_native_application must depend on the c system thunks,
so just make that part of the template instead of requiring the dep
*) there's no such thing as depending on gles2 headers from a component,
so delete the forwarding group.

Most targets that want to use the gles2 headers in a mojo context
want to depend on an implementation through the thunks, so
//mojo/public/c/gles2 does just that. A smaller number of targets (such
as the implementation of the thunks) want to just depend on the headers
but not an impl, so they can depend on //mojo/public/c/gles2:headers.
The //mojo/public/gles target isn't that useful since the only thing we
expose is a set of C entry points.

We can probably also simplify the c system targets, but that's trickier
due to more extensive use from the chromium side.

BUG=438701
R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/780733002

The sky inspector service wants to implement a 1:N broadcast interface with whichever
frontends want to connect. This manages the pipes using a WeakBindingSet, which is a set of
bindings owned by the pipe combined with a list of weak pointers to those bindings allowing
sending messages to all connected clients without having to explicitly keep track of
which clients are connected at a particular point in time.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/711413005

Also remove obsolete reference to gyp files.

R=abarth@chromium.org, brettw@chromium.org, aa@chromium.org

Review URL: https://codereview.chromium.org/713513002

This will make it possible to connect a c++
inspector backend in addition to the JS one.

We lose the feature of running multiple inspector
servers in this patch, but we weren't using that feature
and could easily add it back if we plan to use it.

This patch has a *ton* of boilerplate code due
to crbug.com/431911, hopefully that will be fixed
soon and we can delete all the Impl nonsense.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/710043004

Also fixed //sky/* to pass gn check again.

This makes all of our previous DEPS header checking
obsolete and those can be removed now.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/697733002

Moving the inspector WebSocket proxy server out of the framework directory
simplifies the mappings for the HTTP servers.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/687673004

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/687673003

I also deleted the sky_common and sky_minimal targets
as those were only for the windows build
(which sky does not support).

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/663483006