Add APIs for creating an attribution context

Test: Follow up CL (tracked in the bug below)

bug:158792096

Change-Id: Iecc9e5e52ce130df0fedee18050e2779c4e5eef3

core/java/android/content/Context.java

@@ -6376,6 +6376,19 @@ public abstract class Context {
         throw new RuntimeException("Not implemented. Must override in a subclass.");
     }
 
+    /**
+     * Creates a context with specific properties and behaviors.
+     *
+     * @param contextParams Parameters for how the new context should behave.
+     * @return A context with the specified behaviors.
+     *
+     * @see ContextParams
+     */
+    @NonNull
+    public Context createContext(@NonNull ContextParams contextParams) {
+        throw new RuntimeException("Not implemented. Must override in a subclass.");
+    }
+
     /**
      * Return a new Context object for the current Context but attribute to a different tag.
      * In complex apps attribution tagging can be used to distinguish between separate logical

core/java/android/content/ContextParams.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2021 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.content;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+
+/**
+ * This class represents rules around how a context being created via
+ * {@link Context#createContext} should behave.
+ *
+ * <p>One of the dimensions to customize is how permissions should behave.
+ * For example, you can specify how permission accesses from a context should
+ * be attributed in the platform's permission tracking system.
+ *
+ * <p>The two main types of attribution are: against an attribution tag which
+ * is an arbitrary string your app specifies for the purposes of tracking permission
+ * accesses from a given portion of your app; against another package and optionally
+ * its attribution tag if you are accessing the data on behalf of another app and
+ * you will be passing that data to this app. Both attributions are not mutually
+ * exclusive.
+ *
+ * <p>For example if you have a feature "foo" in your app which accesses
+ * permissions on behalf of app "foo.bar.baz" with feature "bar" you need to
+ * create a context like this:
+ *
+ * <pre class="prettyprint">
+ * context.createContext(new ContextParams.Builder()
+ *     .setAttributionTag("foo")
+ *     .setReceiverPackage("foo.bar.baz", "bar")
+ *     .build())
+ * </pre>
+ *
+ * @see Context#createContext(ContextParams)
+ */
+public final class ContextParams {
+
+    private ContextParams() {
+        /* hide ctor */
+    }
+
+    /**
+     * @return The attribution tag.
+     */
+    @Nullable
+    public String getAttributionTag() {
+        return null;
+    }
+
+    /**
+     * @return The receiving package.
+     */
+    @Nullable
+    public String getReceiverPackage() {
+        return null;
+    }
+
+    /**
+     * @return The receiving package's attribution tag.
+     */
+    @Nullable
+    public String getReceiverAttributionTag() {
+        return null;
+    }
+
+    /**
+     * Builder for creating a {@link ContextParams}.
+     */
+    public static final class Builder {
+
+        /**
+         * Sets an attribution tag against which to track permission accesses.
+         *
+         * @param attributionTag The attribution tag.
+         * @return This builder.
+         */
+        @NonNull
+        public Builder setAttributionTag(@NonNull String attributionTag) {
+            return this;
+        }
+
+        /**
+         * Sets the package and its optional attribution tag that would be receiving
+         * the permission protected data.
+         *
+         * @param packageName The package name receiving the permission protected data.
+         * @param attributionTag An attribution tag of the receiving package.
+         * @return This builder.
+         */
+        @NonNull
+        public Builder setReceiverPackage(@NonNull String packageName,
+                @Nullable String attributionTag) {
+            return this;
+        }
+
+        /**
+         * Creates a new instance. You need to either specify an attribution tag
+         * or a receiver package or both.
+         *
+         * @return The new instance.
+         */
+        @NonNull
+        public ContextParams build() {
+            return new ContextParams();
+        }
+    }
+}