Added a target for a host version of the dart executable.

runtime/bin/BUILD.gn

Index: runtime/bin/BUILD.gn
diff --git a/runtime/bin/BUILD.gn b/runtime/bin/BUILD.gn
index 50db7e92c2bd05a857869ae0b4d7881332f9f37b..c5fc980568762b25f82542eeafeb5118a4086690 100644
--- a/runtime/bin/BUILD.gn
+++ b/runtime/bin/BUILD.gn
@@ -4,13 +4,11 @@
 
 
 declare_args() {
+  dart_third_party_base = "//dart/third_party"
+
   dart_io_support = false
 
-  # TODO(zra, jamesr): Remove this check once we start building boringssl for
-  # the fuchsia port.
-  if (!defined(is_fuchsia) || !is_fuchsia) {
-    dart_boringssl_path = "../../third_party/boringssl"
-  }
+  dart_no_fallback_root_certificates = false
 }
 
 
@@ -270,7 +268,7 @@ source_set("gen_snapshot_dart_io") {
               "..:dart_precompiler_config"]
 
   deps = [
-    "//third_party/zlib",
+    dart_third_party_base + "/zlib",

[zra, 2016/09/19 21:14:27]

As it turns out, in the Flutter engine build, zlib comes from
//third_party/zlib, and boringssl comes from //dart/third_party/boringssl. Sorry
that this is a bit of a mess =(

[P.Y.L., 2016/09/19 21:16:47]

LOL. How about I leave zlib alone for now and we all gather to come up with a
ling-term plan for this?

   ]
 
   custom_sources_filter = [
@@ -299,7 +297,7 @@ source_set("gen_snapshot_dart_io") {
 
   include_dirs = [
     "..",
-    "//third_party"
+    dart_third_party_base,
   ]
 }
 
@@ -338,6 +336,8 @@ source_set("embedded_dart_io") {
 
   if (is_mac || is_ios) {
     libs = [
+      "CoreFoundation.framework",
+      "CoreServices.framework",
       "Security.framework",
     ]
   } else if (defined(is_fuchsia) && is_fuchsia) {
@@ -346,8 +346,13 @@ source_set("embedded_dart_io") {
     ]
   } else {
     deps = [
-      rebase_path(dart_boringssl_path, "."),
+      rebase_path(dart_third_party_base + "/boringssl", "."),
     ]
+    if (is_linux && dart_no_fallback_root_certificates) {
+        defines = [
+          "DART_IO_ROOT_CERTS_DISABLED"
+        ]
+    }
   }
 
   sources = io_impl_sources_gypi.sources + builtin_impl_sources_gypi.sources
@@ -364,13 +369,14 @@ source_set("embedded_dart_io") {
     "log_win.cc",
     "log.h",
   ]
-  if (is_linux) {
-    sources += [ "../../third_party/root_certificates/root_certificates.cc"]
+
+  if (is_linux && !dart_no_fallback_root_certificates) {
+    sources += [ dart_third_party_base + "/root_certificates/root_certificates.cc"]
   }
 
   include_dirs = [
     "..",
-    "//third_party"
+    dart_third_party_base,
   ]
 }
 
@@ -454,41 +460,49 @@ if (defined(is_fuchsia) && is_fuchsia) {
     sources = [ "../tests/vm/dart/hello_fuchsia_test.dart" ]
     outputs = [ "$root_out_dir/hello_fuchsia.dart" ]
   }
+}
 
-  executable("dart_no_observatory") {
-    configs += ["..:dart_config",
-                "..:dart_product_config",
-                "..:dart_precompiled_runtime_config",]
-    deps = [
+executable("dart_no_observatory") {
+  configs += ["..:dart_config",
+              "..:dart_product_config",
+              "..:dart_precompiled_runtime_config",]
+  deps = [
+    ":gen_resources_cc",
+    ":embedded_dart_io",
+    ":libdart_builtin",
+    "../vm:libdart_platform",
+    "..:libdart",
+    ":dart_snapshot_cc",
+    "../../pkg:pkg",  # Pull this out to top-level for a real SDK build.
+    dart_third_party_base + "/zlib",
+  ]
+
+  if (defined(is_fuchsia) && is_fuchsia) {
+    deps += [
       ":hello_fuchsia",
-      ":gen_resources_cc",
-      ":embedded_dart_io",
-      ":libdart_builtin",
-      "../vm:libdart_platform",
-      "..:libdart",
-      ":dart_snapshot_cc",
-      "../../pkg:pkg",  # Pull this out to top-level for a real SDK build.
-      "//third_party/zlib",
     ]
+  }
 
-    defines = [
-      "NO_OBSERVATORY",
-    ]
+  defines = [
+    "NO_OBSERVATORY",
+  ]
 
-    sources = [
-      "main.cc",
-      "observatory_assets_empty.cc",
-      "vmservice_impl.cc",
-      "vmservice_impl.h",
-      "$target_gen_dir/resources_gen.cc",
-    ]
+  sources = [
+    "main.cc",
+    "observatory_assets_empty.cc",
+    "vmservice_impl.cc",
+    "vmservice_impl.h",
+    "$target_gen_dir/resources_gen.cc",
+  ]
 
-    include_dirs = [
-      "..",
-      "//third_party",
-    ]
-  }
+  include_dirs = [
+    "..",
+    dart_third_party_base,
+  ]
+}
 
+
+if (defined(is_fuchsia) && is_fuchsia) {
   action("generate_snapshot_test_dat_file") {
     snapshot_test_dat_file = "$root_gen_dir/snapshot_test.dat"
     snapshot_test_in_dat_file = "../vm/snapshot_test_in.dat"
@@ -529,7 +543,7 @@ if (defined(is_fuchsia) && is_fuchsia) {
       ":dart_snapshot_cc",
       ":generate_snapshot_test_dat_file",
       "../vm:libdart_platform",
-      "//third_party/zlib",
+      dart_third_party_base + "/zlib",
     ]
     include_dirs = [
       "..",