GN: Add libdart_jit and dart_api.

runtime/BUILD.gn

Index: runtime/BUILD.gn
diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index 9bdb93f92f494517f9968def1974b37ab17f8f37..e834102c43e5db4099d80a745398d313ae43317e 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -203,6 +203,16 @@ config("dart_config") {
   }
 }
 
+source_set("dart_api") {
+  public_configs = [ ":dart_public_config" ]
+  sources = [
+    "include/dart_api.h",
+    "include/dart_mirrors_api.h",
+    "include/dart_native_api.h",
+    "include/dart_tools_api.h",
+  ]
+}
+
 template("libdart_library") {
   extra_configs = []
   if (defined(invoker.extra_configs)) {
@@ -240,6 +250,8 @@ template("libdart_library") {
   }
 }
 
+# TODO(rmacnak): Remove after updating all clients to use libdart_jit
+# or libdart_precompiled_runtime.
 libdart_library("libdart") {
   extra_configs = [ ":dart_maybe_precompiled_runtime_config" ]
   extra_deps = [
@@ -248,22 +260,18 @@ libdart_library("libdart") {
   ]
 }
 
-libdart_library("libdart_precompiled_runtime") {
-  extra_configs = [ ":dart_precompiled_runtime_config" ]
+libdart_library("libdart_jit") {
   extra_deps = [
-    "vm:libdart_lib_precompiled_runtime",
-    "vm:libdart_vm_precompiled_runtime",
+    "vm:libdart_lib_jit",
+    "vm:libdart_vm_jit",
   ]
 }
 
-libdart_library("libdart_nosnapshot") {
-  extra_configs = [
-    ":dart_no_snapshot_config",
-    ":dart_maybe_precompiled_runtime_config",
-  ]
+libdart_library("libdart_precompiled_runtime") {
+  extra_configs = [ ":dart_precompiled_runtime_config" ]
   extra_deps = [
-    "vm:libdart_lib_nosnapshot",
-    "vm:libdart_vm_nosnapshot",
+    "vm:libdart_lib_precompiled_runtime",
+    "vm:libdart_vm_precompiled_runtime",
   ]
 }
 
@@ -318,10 +326,10 @@ executable("libdart_dependency_helper") {
   ]
   deps = [
     "third_party/double-conversion/src:libdouble_conversion",
-    "vm:libdart_lib",
-    "vm:libdart_lib_nosnapshot",
-    "vm:libdart_vm",
-    "vm:libdart_vm_nosnapshot",
+    "vm:libdart_lib_jit",
+    "vm:libdart_lib_nosnapshot_with_precompiler",
+    "vm:libdart_vm_jit",
+    "vm:libdart_vm_nosnapshot_with_precompiler",
   ]
   sources = [
     "vm/libdart_dependency_helper.cc",