Introduce dartanalyze into our build.

mojo/public/dart/rules.gni

Index: mojo/public/dart/rules.gni
diff --git a/mojo/public/dart/rules.gni b/mojo/public/dart/rules.gni
index 5845f2e5c096746439eb1bb3c36b67866374f7aa..7200f2812b67eb845e8235268753faec85573371 100644
--- a/mojo/public/dart/rules.gni
+++ b/mojo/public/dart/rules.gni
@@ -54,6 +54,7 @@ template("dart_package") {
 # dart_package targets.
 template("dart_packaged_application") {
   package_name = "${target_name}_package"
+  package_analyze_sources = "${target_name}_analyze"
   package_output = "$target_out_dir/$package_name.dartzip"
 
   if (defined(invoker.output_name)) {
@@ -62,6 +63,36 @@ template("dart_packaged_application") {
     mojo_output = "$root_out_dir/" + target_name + ".mojo"
   }
 
+  action_foreach(package_analyze_sources) {
+    sources = invoker.sources
+
+    script = rebase_path("mojo/public/tools/dart_analyze.py", ".", mojo_root)
+
+    args = [
+      rebase_path(root_gen_dir),
+      rebase_path("$target_gen_dir/{{source_name_part}}.stamp"),
+      "{{source}}",
+      "--no-hints",
+      "--url-mapping=dart:mojo_application,/" +
+          rebase_path("mojo/public/dart/application.dart", "/", mojo_root),
+      "--url-mapping=dart:mojo_bindings,/" +
+          rebase_path("mojo/public/dart/bindings.dart", "/", mojo_root),
+      "--url-mapping=dart:mojo_builtin,/" +
+          rebase_path("mojo/dart/embedder/builtin.dart", "/", mojo_root),
+      "--url-mapping=dart:mojo_core,/" +
+          rebase_path("mojo/public/dart/core.dart", "/", mojo_root),
+    ]
+
+    deps = []
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+
+    outputs = [
+      "$target_gen_dir/{{source_name_part}}.stamp",
+    ]
+  }
+
   dart_package(package_name) {
     sources = invoker.sources
     if (defined(invoker.deps)) {
@@ -89,6 +120,7 @@ template("dart_packaged_application") {
     ]
 
     deps = [
+      ":$package_analyze_sources",
       ":$package_name",
     ]
     if (defined(invoker.deps)) {