Introduce intent manager.

shell/android/intent_manager_impl.cc

+// 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.
+
+#include "shell/android/intent_manager_impl.h"
+
+#include "base/android/jni_android.h"
+#include "jni/IntentReceiverRegistry_jni.h"
+#include "mojo/public/cpp/bindings/error_handler.h"
+
+namespace mojo {
+namespace shell {
+
+namespace {
+
+mojo::Array<uint8> BufferToArray(JNIEnv* env, jobject buffer) {
+  const size_t size = env->GetDirectBufferCapacity(buffer);
+  Array<uint8> result(size);
+  memcpy(&result.front(), env->GetDirectBufferAddress(buffer), size);
+  return result.Pass();
+}
+
+class IntentDispatcher : public ErrorHandler {
+ public:
+  IntentDispatcher(intent::IntentReceiverPtr intent_receiver)
+      : intent_receiver_(intent_receiver.Pass()) {

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

should we call Java_IntentReceiverRegistry_registerReceiver here instead of
outside the class?

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

 It is kind of hard, as registerReceiver is returning an intent, and a
constructor cannot return anything. I would need to keep the intent as an
internal member with a pass method, which is kind of artificial.

+    intent_receiver_.set_error_handler(this);
+  }
+
+  ~IntentDispatcher() {
+    Java_IntentReceiverRegistry_unregisterReceiver(
+        base::android::AttachCurrentThread(),
+        reinterpret_cast<uintptr_t>(this));
+  }
+
+  void OnIntentReceived(JNIEnv* env, jobject intent) {
+    intent_receiver_->OnIntent(BufferToArray(env, intent));
+  }
+
+ private:
+  // Overriden from ErrorHandler
+  void OnConnectionError() {
+    intent_receiver_.set_error_handler(nullptr);
+    delete this;
+  }
+
+  intent::IntentReceiverPtr intent_receiver_;
+};
+
+}  // namespace
+
+void IntentManagerImpl::Bind(InterfaceRequest<intent::IntentManager> request) {
+  bindings_.AddBinding(this, request.Pass());
+}
+
+void IntentManagerImpl::GetIntent(intent::IntentReceiverPtr receiver,
+                                  const GetIntentCallback& callback) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jobject> buffer =
+      Java_IntentReceiverRegistry_registerReceiver(
+          env,
+          reinterpret_cast<uintptr_t>(new IntentDispatcher(receiver.Pass())));
+  callback.Run(BufferToArray(env, buffer.obj()));
+}
+
+bool RegisterIntentReceiverRegistry(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void OnIntentReceived(JNIEnv* env,
+                      jclass jcaller,
+                      jlong intent_dispatcher_ptr,
+                      jobject intent) {
+  IntentDispatcher* intent_dispatcher =
+      reinterpret_cast<IntentDispatcher*>(intent_dispatcher_ptr);
+  intent_dispatcher->OnIntentReceived(env, intent);
+}
+
+}  // namespace shell
+}  // namespace mojo