Uiautomator: Adds missing support functionality

Adds initial implementation of ActionLogger class and adds method to
BaseUiAutomation to automatically generate packageID.

wa/framework/uiauto/app/src/main/java/com/arm/wa/uiauto/ActionLogger.java

@@ -0,0 +1,60 @@
+/*    Copyright 2014-2016 ARM Limited
+ *
+ * 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.
+ */
+
+package com.arm.wa.uiauto;
+
+import android.os.Bundle;
+import android.util.Log;
+    /**
+     * Basic marker API for workloads to generate start and end markers for
+     * deliminating and timing actions. Markers are output to logcat with debug
+     * priority. Actions represent a series of UI interactions to time.
+     *
+     * The marker API provides a way for instruments and result processors to hook into
+     * per-action timings by parsing logcat logs produced per workload iteration.
+     *
+     * The marker output consists of a logcat tag 'UX_PERF' and a message. The
+     * message consists of a name for the action and a timestamp. The timestamp
+     * is separated by a single space from the name of the action.
+     *
+     * Typical usage:
+     *
+     * ActionLogger logger = ActionLogger("testTag", parameters);
+     * logger.start();
+     * // actions to be recorded
+     * logger.stop();
+     */
+    public class ActionLogger {
+
+        private String testTag;
+        private boolean enabled;
+
+        public ActionLogger(String testTag, Bundle parameters) {
+            this.testTag = testTag;
+            this.enabled = parameters.getBoolean("markers_enabled");
+        }
+
+        public void start() {
+            if (enabled) {
+                Log.d("UX_PERF", testTag + "_start " + System.nanoTime());
+            }
+        }
+
+        public void stop() throws Exception {
+            if (enabled) {
+                Log.d("UX_PERF", testTag + "_end " + System.nanoTime());
+            }
+        }
+    }

wa/framework/uiauto/app/src/main/java/com/arm/wa/uiauto/BaseUiAutomation.java

@@ -79,6 +79,12 @@ public class BaseUiAutomation {
         SystemClock.sleep(second * 1000);
     }
 
+    //Generate a package ID
+    public String getPackageID(Bundle parameters) {
+        String packageName = parameters.getString("package_name");
+        return packageName + ":id/";
+    }
+
     public boolean takeScreenshot(String name) {
         Bundle params = getArguments();
         String png_dir = params.getString("workdir");