Use the system provided harfbuzz on chromeos

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index dbfd8243fe7f52f8174d6529da5ac955e2ed5d16..d792a83208b57ab4516aa9965e9cbfe5e3c18ca6 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -151,6 +151,10 @@
         'use_goma%': 0,
         'gomadir%': '',
 
+        # The system root for cross-compiles. Default: none.
+        'sysroot%': '',
+        'chroot_cmd%': '',
+
         'conditions': [
           # Ash needs Aura.
           ['use_aura==0', {
@@ -258,6 +262,8 @@
       'buildtype%': '<(buildtype)',
       'branding%': '<(branding)',
       'arm_version%': '<(arm_version)',
+      'sysroot%': '<(sysroot)',
+      'chroot_cmd%': '<(chroot_cmd)',
 
       # Set to 1 to enable fast builds. Set to 2 for even faster builds
       # (it disables debug info for fastest compilation - only for use
@@ -283,10 +289,6 @@
       # Detect NEON support at run-time.
       'arm_neon_optional%': 0,
 
-      # The system root for cross-compiles. Default: none.
-      'sysroot%': '',
-      'chroot_cmd%': '',
-
       # The system libdir used for this ABI.
       'system_libdir%': 'lib',
 
@@ -297,6 +299,9 @@
       # use_libjpeg_turbo is set.
       'use_system_libjpeg%': 0,
 
+      # Use system libharfbuzz-ng.
+      'use_system_harfbuzz%': 0,
+
       # By default, component is set to static_library and it can be overriden
       # by the GYP command line or by ~/.gyp/include.gypi.
       'component%': 'static_library',
@@ -737,6 +742,10 @@
         ['chromeos==1', {
           # When building for ChromeOS we dont want Chromium to use libjpeg_turbo.
           'use_libjpeg_turbo%': 0,
+
+          # On ChromeOS, we use the system libharfbuzz-ng, since we use a
+          # recent version of libpangoft2 that already includes it.
+          'use_system_harfbuzz%': 1,
         }],
 
         ['OS=="android"', {
@@ -981,6 +990,7 @@
     'wix_path%': '<(wix_path)',
     'use_libjpeg_turbo%': '<(use_libjpeg_turbo)',
     'use_system_libjpeg%': '<(use_system_libjpeg)',
+    'use_system_harfbuzz%': '<(use_system_harfbuzz)',
     'android_webview_build%': '<(android_webview_build)',
     'icu_use_data_file_flag%': '<(icu_use_data_file_flag)',
     'gyp_managed_install%': 0,
@@ -2979,8 +2989,7 @@
     },
   },
   'conditions': [
-    # TODO(jochen): Enable this on chromeos. http://crbug.com/353127 
-    ['os_posix==1 and chromeos==0', {
+    ['os_posix==1', {
       'target_defaults': {
         'ldflags': [
           '-Wl,--fatal-warnings',