Add chromecast_build gyp variable and add rules when the variable is set to 1.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 140 matching lines @@
         'target_arch%': '<(target_arch)',
 
         'target_subarch%': '',
 
         # This is set when building the Android WebView inside the Android
         # build system, using the 'android' gyp backend. The WebView code is
         # still built when this is unset, but builds using the normal chromium
         # build system.
         'android_webview_build%': 0,
 
+        # This is set when building Chromecast using the build environment
+        # and scripts inside Chromecast directory.
+        'chromecast_build%': 0,
+
         # Set ARM architecture version.
         'arm_version%': 7,
 
         # Use aurax11 for clipboard implementation. This is true on linux_aura.
         'use_clipboard_aurax11%': 0,
 
         # goma settings.
         # 1 to use goma.
         # If no gomadir is set, it uses the default gomadir.
         'use_goma%': 0,
@@ skipping 90 matching lines @@
       'use_ozone%': '<(use_ozone)',
       'use_ozone_evdev%': '<(use_ozone_evdev)',
       'use_clipboard_aurax11%': '<(use_clipboard_aurax11)',
       'embedded%': '<(embedded)',
       'use_openssl%': '<(use_openssl)',
       'use_openssl_certs%': '<(use_openssl_certs)',
       'use_system_fontconfig%': '<(use_system_fontconfig)',
       'enable_viewport%': '<(enable_viewport)',
       'enable_hidpi%': '<(enable_hidpi)',
       'android_webview_build%': '<(android_webview_build)',
+      'chromecast_build%': '<(chromecast_build)',
       'use_goma%': '<(use_goma)',
       'gomadir%': '<(gomadir)',
       'enable_app_list%': '<(enable_app_list)',
       'use_default_render_theme%': '<(use_default_render_theme)',
       'buildtype%': '<(buildtype)',
       'branding%': '<(branding)',
       'arm_version%': '<(arm_version)',
       'sysroot%': '<(sysroot)',
       'chroot_cmd%': '<(chroot_cmd)',
 
@@ skipping 749 matching lines @@
     'cld2_table_size%': '<(cld2_table_size)',
     'cld2_dynamic%': '<(cld2_dynamic)',
     'enable_captive_portal_detection%': '<(enable_captive_portal_detection)',
     'disable_ftp_support%': '<(disable_ftp_support)',
     'enable_task_manager%': '<(enable_task_manager)',
     'sas_dll_path%': '<(sas_dll_path)',
     'wix_path%': '<(wix_path)',
     'use_libjpeg_turbo%': '<(use_libjpeg_turbo)',
     'use_system_libjpeg%': '<(use_system_libjpeg)',
     'android_webview_build%': '<(android_webview_build)',
+    'chromecast_build%': '<(chromecast_build)',
     'icu_use_data_file_flag%': '<(icu_use_data_file_flag)',
     'gyp_managed_install%': 0,
     'create_standalone_apk%': 1,
     'enable_app_list%': '<(enable_app_list)',
     'use_default_render_theme%': '<(use_default_render_theme)',
     'enable_settings_app%': '<(enable_settings_app)',
     'google_api_key%': '<(google_api_key)',
     'google_default_client_id%': '<(google_default_client_id)',
     'google_default_client_secret%': '<(google_default_client_secret)',
     'enable_managed_users%': '<(enable_managed_users)',
@@ skipping 1436 matching lines @@
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'true',
               },
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '1',
               }
             }
           }],
         ],  # win_z7!=0
       }],  # OS==win
+      ['chromecast_build==1', {
+        'defines': [
+          'CHROMECAST_BUILD',

[darin (slow to review), 2014/04/14 04:50:35]

I think it would be nice to see if we could solve for Chromecast without
introducing an #ifdef. I realize that we have #ifdefs for other ports, but
adding an #ifdef for every port just doesn't scale. Each has its own recipe of
things to enable / disable. We have likewise resisted an OPERA_BUILD #ifdef.

Looking over the various patches I have seen it seems like it should be possible
to extract code into separate files, eliminating #ifdefs in favor of selecting
the right .cc files at build time.

+          'LOG_DISABLED=0',
+          'ENABLE_MPEG2TS_STREAM_PARSER',

[damienv1, 2014/04/03 21:45:33]

There is now a gyp parameter the mpeg2 TS parser: enable_mpeg2ts_stream_parser.
See https://codereview.chromium.org/216423008/

+        ],
+        'conditions': [
+          ['target_arch=="arm"', {
+            'defines': [
+              # Work around an error when compiling v8/src/platform-linux.cc
+              # with gcc-4.5.
+              '__SOFTFP',
+            ],
+          }],
+        ],
+      }],
       ['enable_task_manager==1', {
         'defines': [
           'ENABLE_TASK_MANAGER=1',
         ],
       }],
       ['enable_extensions==1', {
         'defines': [
           'ENABLE_EXTENSIONS=1',
         ],
       }],
@@ skipping 959 matching lines @@
                           '-B<(PRODUCT_DIR)/../../build/android/arm-linux-androideabi-gold',
                         ],
                       }],
                       ['asan==1', {
                         'cflags': [
                           '-marm', # Required for frame pointer based stack traces.
                         ],
                       }],
                     ],
                   }],
+                  ['chromecast_build==1', {
+                    'cflags': [
+                      # We set arm_arch to "" so that -march compiler option
+                      # is not set.  Otherwise a gcc bug that would complain
+                      # about it conflicting with '-mcpu=cortex-a9'. The flag
+                      # '-march=armv7-a' is actually redundant anyway because
+                      # it is enabled by default when we built the toolchain.
+                      # And using '-mcpu=cortex-a9' should be sufficient.
+                      '-mcpu=cortex-a9',
+                      '-funwind-tables',
+                      # Breakpad requires symbols with debugging information
+                      '-g',
+                    ],
+                    'ldflags': [
+                      # We want to statically link libstdc++/libgcc_s.
+                      '-static-libstdc++',
+                      '-static-libgcc',
+                    ],
+                    'cflags!': [
+                      # Some components in Chormium (e.g. v8) define their own
+                      # cflags that are not desirable. Remove them explicitly
+                      # here.
+                      '-march=armv7-a',
+                      '-mtune=cortex-a8',
+                    ],
+                  }],
                 ],
               }],
             ],
           }],
           ['target_arch=="arm64"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'conditions': [
                   ['OS=="android"', {
                     'cflags!': [
@@ skipping 1719 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }