[chromecast] Add CAST_PRODUCT_TYPE controlled at build time.

chromecast/chromecast.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'android_support_v13_target%':
         '../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
     'cast_build_release': 'internal/build/cast_build_release',
     'cast_is_debug_build%': 0,
+    # Refers to enum CastProductType in components/metrics/proto/cast_logs.proto
+    'cast_product_type%': 0,  # CAST_PRODUCT_TYPE_UNKNOWN
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
     'disable_display%': 0,
     'enable_default_cast_graphics%': 1,
     'ozone_platform_cast%': 0,
     'use_chromecast_webui%': 0,
   },
   'includes': [
     'chromecast_tests.gypi',
   ],
@@ skipping 310 matching lines @@
             'python',
             '<(version_py_path)',
             '-e', 'VERSION_FULL="<(version_full)"',
             # CAST_BUILD_INCREMENTAL is taken from buildbot if available;
             # otherwise, a dev string is used.
             '-e', 'CAST_BUILD_INCREMENTAL="<!(echo ${CAST_BUILD_INCREMENTAL:="<!(date +%Y%m%d.%H%M%S)"})"',
             # CAST_BUILD_RELEASE is taken from cast_build_release file if exist;
             # otherwise, a dev string is used.
             '-e', 'CAST_BUILD_RELEASE="<!(if test -f <(cast_build_release); then cat <(cast_build_release); else echo eng.${USER}; fi)"',
             '-e', 'CAST_IS_DEBUG_BUILD=1 if "<(CONFIGURATION_NAME)" == "Debug" or <(cast_is_debug_build) == 1 else 0',
+            '-e', 'CAST_PRODUCT_TYPE=<(cast_product_type)',
             'common/version.h.in',
             '<@(_outputs)',
           ],
           'includes': [
             '../build/util/version.gypi',
           ],
         },
       ],
     },
   ],  # end of targets
@@ skipping 236 matching lines @@
           ],
           'sources': [
             'graphics/cast_egl_platform_default.cc',
             'graphics/graphics_properties_default.cc'
           ],
         }
       ]
     }],
   ],  # end of conditions
 }