Update Travis to account for buildroot (#2894)

travis/.gitignore

-.idea/
-.vagrant/
-.sconsign.dblite
-.svn/
-
-.DS_Store
-*.swp
-*.lock
-profile
-
-DerivedData/
-build/
-
-*.pbxuser
-*.mode1v3
-*.mode2v3
-*.perspectivev3
-
-!default.pbxuser
-!default.mode1v3
-!default.mode2v3
-!default.perspectivev3
-
-xcuserdata
-
-*.moved-aside

travis/build.sh

@@ -3,6 +3,8 @@ set -ex
 
 PATH="$HOME/depot_tools:$PATH"
 
-sky/tools/gn --unoptimized
+cd ..
+
+flutter/tools/gn --unoptimized
 ninja -C out/host_debug_unopt generate_dart_ui
-travis/analyze.sh
+flutter/travis/analyze.sh

travis/gclient

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

travis/setup.sh

@@ -6,10 +6,10 @@ set -ex
 PATH="$HOME/depot_tools:$PATH"
 
 cd ..
-mv engine src
-mkdir engine
-mv src engine
-cd engine/src
+mv engine flutter
+mkdir src
+mv flutter src
+cd src
 
-mv travis/gclient ../.gclient
+mv flutter/travis/gclient ../.gclient
 gclient sync