Fetching license files now talks to an external endpoint
which spins up a headless version of Chrome to fetch license info.

Test: Tested the license files.
Fixes: b/130834419

Change-Id: I06a97787743bb78688c67544ece68805f1cb9377
diff --git a/development/fetchLicenses/logger.ts b/development/fetchLicenses/logger.ts
new file mode 100644
index 0000000..4ca436b
--- /dev/null
+++ b/development/fetchLicenses/logger.ts
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+import { IS_LOG, IS_PROFILE } from './flags';
+
+export function log(message: string, ...args: any[]) {
+  if (IS_LOG) {
+    let length = args ? args.length : 0;
+    if (length > 0) {
+      console.log(message, ...args);
+    } else {
+      console.log(message);
+    }
+  }
+};
+
+export function logError(message: string, ...args: any[]) {
+  let length = args ? args.length : 0;
+  if (length > 0) {
+    console.error(message, ...args);
+  } else {
+    console.error(message);
+  }
+};
+
+// check to see if native support for profiling is available.
+const NATIVE_PROFILE_SUPPORT =
+  typeof window !== 'undefined' && !!window.performance && !!console.profile;
+
+/**
+ * A decorator that can profile a function.
+ */
+export function profile(
+  target: any, propertyKey: string, descriptor: PropertyDescriptor) {
+  if (IS_PROFILE) {
+    return performProfile(target, propertyKey, descriptor);
+  } else {
+    // return as-is
+    return descriptor;
+  }
+}
+
+function performProfile(
+  target: any, propertyKey: string,
+  descriptor: PropertyDescriptor): PropertyDescriptor {
+  let originalCallable = descriptor.value;
+  // name must exist
+  let name = originalCallable.name;
+  if (!name) {
+    name = 'anonymous function';
+  }
+  if (NATIVE_PROFILE_SUPPORT) {
+    descriptor.value = function (...args: any[]) {
+      console.profile(name);
+      let startTime = window.performance.now();
+      let result = originalCallable.call(this || window, ...args);
+      let duration = window.performance.now() - startTime;
+      console.log(`${name} took ${duration} ms`);
+      console.profileEnd();
+      return result;
+    };
+  } else {
+    descriptor.value = function (...args: any[]) {
+      log(`Profile start ${name}`);
+      let start = Date.now();
+      let result = originalCallable.call(this || window, ...args);
+      let duration = Date.now() - start;
+      log(`Profile end ${name} took ${duration} ms.`);
+      return result;
+    };
+  }
+  return descriptor;
+}