Add global release flag that will attempt to use release builds during install.

packages/flutter/lib/sky_tool

@@ -175,7 +175,9 @@ class StartSky(object):
 
         project_or_path = os.path.abspath(args.project_or_path)
 
-        if args.android_build_available:
+        if args.android_build_available and args.use_release:
+            apk_path = os.path.join(os.path.normpath(args.sky_src_path), args.android_release_build_path, 'apks', APK_NAME)
+        elif args.android_build_available:
             apk_path = os.path.join(os.path.normpath(args.sky_src_path), args.android_debug_build_path, 'apks', APK_NAME)
         else:
             apk_path = os.path.join(APK_DIR, APK_NAME)
@@ -228,12 +230,18 @@ class StartSky(object):
 
             # Install on connected iOS device
             if IOSDevice.is_connected() and args.ios_build_available:
-                app_path = os.path.join(args.sky_src_path, args.ios_debug_build_path, IOS_APP_NAME)
+                if args.use_release:
+                    app_path = os.path.join(args.sky_src_path, args.ios_release_build_path, IOS_APP_NAME)
+                else:
+                    app_path = os.path.join(args.sky_src_path, args.ios_debug_build_path, IOS_APP_NAME)
                 IOSDevice.install_app(app_path)
 
             # Install on iOS simulator if it's running
             if IOSSimulator.is_booted() and args.ios_sim_build_available:
-                app_path = os.path.join(args.sky_src_path, args.ios_sim_debug_build_path, IOS_APP_NAME)
+                if args.use_release:
+                    app_path = os.path.join(args.sky_src_path, args.ios_sim_release_build_path, IOS_APP_NAME)
+                else:
+                    app_path = os.path.join(args.sky_src_path, args.ios_sim_debug_build_path, IOS_APP_NAME)
                 IOSSimulator.fork_install_app(app_path)
 
         # Set up port forwarding for observatory
@@ -618,6 +626,11 @@ class StartListening(object):
         return True
 
     def run(self, args, pids):
+        if args.use_release:
+            logging.info('Note that the listen command is not compatible with the '
+                         'release flag for iOS and iOS simulator builds. If you have '
+                         'installed iOS release builds, your Sky app will fail to '
+                         'reload while using listen.')
         tempdir = tempfile.mkdtemp()
         currdir = os.getcwd()
         while True:
@@ -819,6 +832,12 @@ class SkyShellRunner(object):
             sys.exit(2)
 
         parser = argparse.ArgumentParser(description='Sky App Runner')
+        parser.add_argument('--release', dest='use_release', action='store_true',
+            help='Set this if you are building Sky locally and want to use the release build products. '
+                 'When set, attempts to automaticaly determine sky-src-path if sky-src-path is '
+                 'not set. Using this flag automatically turns on local-build as well, so you do not '
+                 'need to specify both. Note that --release is not compatible with the listen command '
+                 'on iOS devices and simulators. Not normally required.')
         parser.add_argument('--local-build', dest='local_build', action='store_true',
             help='Set this if you are building Sky locally and want to use those build products. '
                  'When set, attempts to automaticaly determine sky-src-path if sky-src-path is '
@@ -830,14 +849,26 @@ class SkyShellRunner(object):
             help='Path to your Android Debug out directory, if you are building Sky locally. '
                  'This path is relative to sky-src-path. Not normally required.',
             default='out/android_Debug/')
+        parser.add_argument('--android-release-build-path', dest='android_release_build_path',
+            help='Path to your Android Release out directory, if you are building Sky locally. '
+                 'This path is relative to sky-src-path. Not normally required.',
+            default='out/android_Release/')
         parser.add_argument('--ios-debug-build-path', dest='ios_debug_build_path',
             help='Path to your iOS Debug out directory, if you are building Sky locally. '
                  'This path is relative to sky-src-path. Not normally required.',
             default='out/ios_Debug/')
+        parser.add_argument('--ios-release-build-path', dest='ios_release_build_path',
+            help='Path to your iOS Release out directory, if you are building Sky locally. '
+                 'This path is relative to sky-src-path. Not normally required.',
+            default='out/ios_Release/')
         parser.add_argument('--ios-sim-debug-build-path', dest='ios_sim_debug_build_path',
             help='Path to your iOS Simulator Debug out directory, if you are building Sky locally. '
                  'This path is relative to sky-src-path. Not normally required.',
             default='out/ios_sim_Debug/')
+        parser.add_argument('--ios-sim-release-build-path', dest='ios_sim_release_build_path',
+            help='Path to your iOS Simulator Release out directory, if you are building Sky locally. '
+                 'This path is relative to sky-src-path. Not normally required.',
+            default='out/ios_sim_Release/')
 
         subparsers = parser.add_subparsers(help='sub-command help')
 
@@ -845,6 +876,9 @@ class SkyShellRunner(object):
             command.add_subparser(subparsers)
 
         args = parser.parse_args()
+        if args.use_release:
+            args.local_build = True
+
         # TODO(iansf): args is unfortunately just a global context variable.  For now, add some additional context to it.
         args.android_build_available = False
         args.ios_build_available = False
@@ -880,7 +914,14 @@ class SkyShellRunner(object):
                 logging.warning('The selected sky-src-path (' + args.sky_src_path + ') does not exist.'
                                 'Disabling local-build flag.')
                 args.local_build = False
-        if args.local_build:
+        if args.local_build and args.use_release:
+            if os.path.isdir(os.path.join(args.sky_src_path, args.android_release_build_path)):
+                args.android_build_available = True
+            if os.path.isdir(os.path.join(args.sky_src_path, args.ios_release_build_path)):
+                args.ios_build_available = True
+            if os.path.isdir(os.path.join(args.sky_src_path, args.ios_sim_release_build_path)):
+                args.ios_sim_build_available = True
+        elif args.local_build:
             if os.path.isdir(os.path.join(args.sky_src_path, args.android_debug_build_path)):
                 args.android_build_available = True
             if os.path.isdir(os.path.join(args.sky_src_path, args.ios_debug_build_path)):