Initial checkin of chromecast content embedder (cast_shell) and related build scripts.

chromecast/build/build_env_x86_linux.sh

+# Copyright (c) 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.
+
+function setup_chromium_env_x86_linux() {
+  setup_chromium_env_common x86_linux $@
+
+  unset CC
+  unset CXX
+
+# undo setup_build_toolchain()
+  unset AR_target
+  unset CC_target
+  unset CXX_target
+  unset LD_target
+  unset OBJCOPY_target
+  unset STRIP_target
+
+  setup_goma_or_ccache gcc g++
+
+  # leaving the target arch empty for the system to decide which one to use
+  # (32 bit or 64 bit).
+  # use_system_libjpeg=1: use native libjpeg for x86 builds
+  local defines="\
+disable_nacl=1 \
+safe_browsing=0 \
+use_system_libjpeg=1
+"
+  export GYP_DEFINES="${GYP_DEFINES} ${defines}"
+}
+
+function setup_chrome_env_x86_linux() {
+  setup_chromium_env_x86_linux $@
+  brand_as_chrome
+}