Fuchsia: Allows building the full SDK for host and target.

BUILD.gn

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This target will be built if no target is specified when invoking ninja.
 group("default") {
+  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+    # Fuchsia has run_vm_tests marked testonly.
+    testonly = true
+  }
   deps = [
     ":runtime",
   ]
 }
 
 group("most") {
+  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+    # Fuchsia has run_vm_tests marked testonly.
+    testonly = true
+  }
   deps = [
     ":analysis_server",
     ":create_sdk",
     ":dart2js",
     ":dartanalyzer",
     ":dartdevc",
     ":runtime",
     ":samples",
   ]
 }
 
 group("runtime") {
+  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+    # Fuchsia has run_vm_tests marked testonly.
+    testonly = true
+  }
   deps = [
     "runtime/bin:dart",
     "runtime/bin:dart_bootstrap($host_toolchain)",
     "runtime/bin:process_test",
     "runtime/bin:run_vm_tests",
     "runtime/bin:sample_extension",
     "runtime/bin:test_extension",
     "runtime/vm:patched_sdk",
   ]
 }
 
 group("runtime_precompiled") {
   deps = [
     "runtime/bin:dart_bootstrap($host_toolchain)",
     "runtime/bin:dart_precompiled_runtime",
     "runtime/vm:patched_sdk",
   ]
 }
 
 group("runtime_and_noopt") {
+  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+    testonly = true
+  }
   deps = [
     "runtime/bin:dart",
     "runtime/bin:dart_bootstrap($host_toolchain)",
     "runtime/bin:dart_noopt",
     "runtime/bin:process_test",
     "runtime/bin:run_vm_tests",
     "runtime/bin:sample_extension",
     "runtime/bin:test_extension",
     "runtime/vm:patched_sdk",
   ]
@@ skipping 103 matching lines @@
   deps = [
     ":create_sdk",
   ]
 }
 
 group("samples") {
   deps = [
     "runtime/bin:sample_extension",
   ]
 }