Introduce intent manager.

shell/android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java

Index: shell/android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java
diff --git a/shell/android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java b/shell/android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java
new file mode 100644
index 0000000000000000000000000000000000000000..819e8e695b85a19f99891a0831253342b2afcf25
--- /dev/null
+++ b/shell/android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java
@@ -0,0 +1,82 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.mojo.shell;
+
+import android.content.Intent;
+import android.os.Parcel;
+
+import org.chromium.base.ApplicationStatus;
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+import java.nio.ByteBuffer;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * Java class for services/android/intent.mojom. Create intent for privileged mojo applications and

[ppi, 2015/04/07 15:42:14]

The first sentence feels ambiguous. Please indicate if this is implementation of
an interface defined in intent.mojom. If not, please clarify how exactly (e.g.
through what intermediaries) this relates to intent.mojom.

[qsr, 2015/04/08 10:04:14]

Done.

+ * route received intent back to the mojo application.
+ */
+@JNINamespace("mojo::shell")
+public class IntentReceiverRegistry {
+    private static class LazyHolder {
+        private static final IntentReceiverRegistry INSTANCE = new IntentReceiverRegistry();
+    }
+
+    /**
+     * Returns the instance.
+     */
+    public static IntentReceiverRegistry getInstance() {
+        return LazyHolder.INSTANCE;
+    }
+
+    private final Map<String, Long> mReceiversByUUID = new HashMap<>();

[ppi, 2015/04/07 15:42:14]

Should this be mReceiversByUuid to match the style below?

[qsr, 2015/04/08 10:04:13]

Done.

+    private final Map<Long, String> mUuidsByReceiver = new HashMap<>();
+
+    private IntentReceiverRegistry() {}
+
+    public void onIntentReceived(Intent intent) {
+        String uuid = intent.getAction();
+        if (uuid == null) return;
+        Long ptr = mReceiversByUUID.get(uuid);
+        if (ptr == null) return;
+        nativeOnIntentReceived(ptr, intentToBuffer(intent));
+    }
+
+    private static ByteBuffer intentToBuffer(Intent intent) {
+        Parcel p = Parcel.obtain();
+        intent.writeToParcel(p, 0);
+        p.setDataPosition(0);
+        byte[] b = p.marshall();
+        ByteBuffer result = ByteBuffer.allocateDirect(b.length);
+        result.put(b);
+        result.flip();
+        return result;
+    }
+
+    @CalledByNative
+    private static ByteBuffer registerReceiver(long intentDispatcher) {
+        IntentReceiverRegistry registry = getInstance();
+        String uuid = UUID.randomUUID().toString();
+        Intent intent = new Intent(uuid, null, ApplicationStatus.getApplicationContext(),
+                DelegatingIntentService.class);
+        registry.mReceiversByUUID.put(uuid, intentDispatcher);
+        registry.mUuidsByReceiver.put(intentDispatcher, uuid);
+        return intentToBuffer(intent);
+    }
+
+    @CalledByNative
+    private static void unregisterReceiver(long intentDispatcher) {
+        IntentReceiverRegistry registry = getInstance();
+        String uuid = registry.mUuidsByReceiver.get(intentDispatcher);
+        if (uuid != null) {
+            registry.mUuidsByReceiver.remove(intentDispatcher);
+            registry.mReceiversByUUID.remove(uuid);
+        }
+    }
+
+    private static native void nativeOnIntentReceived(long intentDispatcher, ByteBuffer intent);
+}