Make perf metrics collection & output via instrumentation simpler

- Added includeDetailedStats metadata to TimedTest for collecting additional
  metrics like memory usage and binder transactions
- Added PerformanceCollectorTestCase interface for hard-typing test class as
  performance test while still able to inherit from instrumenation test classes
- Reverted previous changes to PerformanceTestBase, will deprecate
  PerformanceTestBase/Case in a future CL
- Removed 'performance.' prefix from keys written to instrumentation output

core/java/android/test/TimedTest.java

@@ -1,32 +0,0 @@
-/*
- * Copyright (C) 2009 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.
- */
-
-package android.test;
-
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-
-/**
- * This annotation can be used on an {@link junit.framework.TestCase}'s test
- * methods. When the annotation is present, the test method is timed and the
- * results written through instrumentation output. It can also be used on the
- * class itself, which is equivalent to tagging all test methods with this
- * annotation.
- *
- * {@hide} Pending approval for public API.
- */
-@Retention(RetentionPolicy.RUNTIME)
-public @interface TimedTest { }