Have Travis check the build for Dart errors.

.travis.yml

-language: cpp
+language: dart
+dart: stable
 sudo: false
-compiler:
-  - gcc
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    packages:
-    - gcc-4.8
-    - g++-4.8
 before_script:
   - ./travis/setup.sh
 script:

sky/engine/core/painting/ColorFilter.dart

@@ -9,5 +9,5 @@ class ColorFilter extends _ColorFilter {
   // This is the only ColorFilter type we need, but use a named constructor so
   // we can add more in the future.
   ColorFilter.mode(Color color, TransferMode transferMode)
-      : super(color, transferMode) {}
+    : super(color, transferMode);
 }

travis/analyze.sh

+echo "Analyzing dart:ui library..."
+RESULTS=`dartanalyzer --ignore-unrecognized-flags --supermixin --enable-strict-call-checks --enable_type_checks --strong --package-warnings --fatal-warnings --strong-hints --fatal-hints --lints out/Debug/gen/sky/bindings/dart_ui.dart 2>&1 | grep -v "\[error\] Native functions can only be declared in the SDK and code that is loaded through native extensions" | grep -Ev "\[hint\] The function '.+' is not used" | grep -v "\[warning\] Undefined name 'main'" | grep -Ev "[0-9]+ errors found." | grep -v "Analyzing \[out/Debug/gen/sky/bindings/dart_ui.dart\]\.\.\."`
+echo "$RESULTS"
+if [ -n "$RESULTS" ]; then exit 1; fi

travis/before_install.sh

-#!/bin/bash
-set -ex
-

travis/build.sh

 #!/bin/bash
 set -ex
 
-# Smoke test sky_shell.
-./out/sky_shell --help
+PATH="$HOME/depot_tools:$PATH"
 
-# Run the tests.
-pushd sky/unit
-SKY_SHELL=../../out/sky_shell ../../third_party/dart-sdk/dart-sdk/bin/pub run sky_tools:sky_test -j 1
-popd
-
-# Analyze the code.
-pushd sky/packages/workbench
-../../../third_party/dart-sdk/dart-sdk/bin/pub get
-popd
-pushd sky/packages/sky
-../../tools/skyanalyzer --congratulate
-popd
-
-# Generate docs.
-./sky/tools/skydoc.py
+(cd ..; gclient sync)
+sky/tools/gn --debug
+ninja -C out/Debug generate_dart_ui
+travis/analyze.sh

travis/gclient

+solutions = [{
+  "name"        : "..",
+  "url"         : "https://github.com/flutter/engine.git",
+  "deps_file"   : "DEPS",
+  "managed"     : False,
+  "safesync_url": "",
+}]
+target_os = ['linux']

travis/setup.sh

 #!/bin/bash
 set -ex
 
-./tools/dart/update.py
+(cd; git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git)
 
-(cd sky/unit; ../../third_party/dart-sdk/dart-sdk/bin/pub get)
-(cd sky/packages/sky; ../../../third_party/dart-sdk/dart-sdk/bin/pub get)
+cd ..
+mv engine src
+mkdir engine
+mv src engine
+cd engine/src
 
-./sky/tools/download_sky_shell.py sky/unit/packages/sky_engine/REVISION out
+mv travis/gclient ../.gclient