move HelloWorld to be a peer of SampleApp

gyp/most.gyp

 # Build ALMOST everything provided by Skia; this should be the default target.
 #
 # This omits the following targets that many developers won't want to build:
 # - debugger: this requires QT to build
 #
 {
   'variables': {
     'skia_skip_gui%': 0,
   },
   'targets': [
     {
       'target_name': 'most',
       'type': 'none',
       'dependencies': [
         # The minimal set of static libraries for basic Skia functionality.
         'skia_lib.gyp:skia_lib',
 
         'bench.gyp:*',
+        'example.gyp:HelloWorld',
         'SampleApp.gyp:SampleApp',
         'tools.gyp:tools',
         'pathops_unittest.gyp:*',
         'pathops_skpclip.gyp:*',
 #       'pdfviewer.gyp:pdfviewer',
         'dm.gyp:dm',
       ],
       'conditions': [
+        [ 'skia_gpu == 0 or skia_os == "android"', {
+          'dependencies!': [
+            'example.gyp:HelloWorld',
+          ],
+        }],
         ['skia_os == "android"', {
           'dependencies': [ 'android_system.gyp:SampleApp_APK' ],
         }],
         ['skia_os == "ios"', {
-          'dependencies!': [ 'SampleApp.gyp:SampleApp' ],
+          'dependencies!': [
+            'example.gyp:HelloWorld',
+            'SampleApp.gyp:SampleApp',
+          ],
           'dependencies': ['iOSShell.gyp:iOSShell' ],
         }],
         ['skia_os == "mac" or skia_os == "linux"', {
           'dependencies': [ 'nanomsg.gyp:*' ],
         }],
         [ 'skia_skip_gui',
           {
             'dependencies!': [
+              'example.gyp:HelloWorld',
               'SampleApp.gyp:SampleApp',
             ]
           }
         ]
       ],
     },
   ],
 }