Add support for AOSP's nullability annotations.

These are different than 'android.support.annotation' in that they are used on the JVM for projects within AOSP.

compiler/testData/foreignAnnotations/annotations/com/android/annotations/NonNull.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2011 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 com.android.annotations;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PARAMETER;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Denotes that a parameter, field or method return value can never be null.
+ * <p/>
+ * This is a marker annotation and it has no specific attributes.
+ */
+@Documented
+@Retention(RetentionPolicy.SOURCE)
+@Target({METHOD,PARAMETER,LOCAL_VARIABLE,FIELD})
+public @interface NonNull {
+}

compiler/testData/foreignAnnotations/annotations/com/android/annotations/Nullable.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2011 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 com.android.annotations;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PARAMETER;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Denotes that a parameter, field or method return value can be null.
+ * <b>Note</b>: this is the default assumption for most Java APIs and the
+ * default assumption made by most static code checking tools, so usually you
+ * don't need to use this annotation; its primary use is to override a default
+ * wider annotation like {@link NonNullByDefault}.
+ * <p/>
+ * When decorating a method call parameter, this denotes the parameter can
+ * legitimately be null and the method will gracefully deal with it. Typically
+ * used on optional parameters.
+ * <p/>
+ * When decorating a method, this denotes the method might legitimately return
+ * null.
+ * <p/>
+ * This is a marker annotation and it has no specific attributes.
+ */
+@Documented
+@Retention(RetentionPolicy.SOURCE)
+@Target({METHOD, PARAMETER, LOCAL_VARIABLE, FIELD})
+public @interface Nullable {
+}