Add external lazy camera provider 2.7

 Add default implementation for external camera
 provider with lazy HAL support v2.7.

 Test configuration for devices:
 PRODUCT_PACKAGES += android.hardware.camera.provider@2.7-impl
 PRODUCT_PACKAGES += android.hardware.camera.provider@2.7-external-service-lazy
 PRODUCT_PROPERTY_OVERRIDES += ro.camera.enableLazyHal=true

Test: atest CtsCameraTestCases
      atest VtsHalCameraProviderV2_4TargetTest

Bug: 191248460

Change-Id: I57c8130d7c331028eff35dc68e360fdd8d8c32e2
diff --git a/camera/provider/2.7/default/external-service.cpp b/camera/provider/2.7/default/external-service.cpp
new file mode 100644
index 0000000..90b8239
--- /dev/null
+++ b/camera/provider/2.7/default/external-service.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright 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.
+ */
+
+#ifdef LAZY_SERVICE
+#define LOG_TAG "android.hardware.camera.provider@2.7-external-service-lazy"
+#else
+#define LOG_TAG "android.hardware.camera.provider@2.7-external-service"
+#endif
+
+#include <android/hardware/camera/provider/2.7/ICameraProvider.h>
+#include <binder/ProcessState.h>
+#include <hidl/HidlLazyUtils.h>
+#include <hidl/HidlTransportSupport.h>
+
+#include "CameraProvider_2_7.h"
+#include "ExternalCameraProviderImpl_2_7.h"
+
+using android::status_t;
+using android::hardware::camera::provider::V2_7::ICameraProvider;
+using android::hidl::base::V1_0::IBase;
+
+#ifdef LAZY_SERVICE
+const bool kLazyService = true;
+#else
+const bool kLazyService = false;
+#endif
+
+int main() {
+    using namespace android::hardware::camera::provider::V2_7::implementation;
+
+    ALOGI("CameraProvider@2.7 external webcam service is starting.");
+
+    ::android::hardware::configureRpcThreadpool(/*threads*/ HWBINDER_THREAD_COUNT,
+                                                /*willJoin*/ true);
+
+    ::android::sp<CameraProvider<ExternalCameraProviderImpl_2_7>> provider =
+            new CameraProvider<ExternalCameraProviderImpl_2_7>();
+
+    status_t status;
+    if (kLazyService) {
+        auto serviceRegistrar = ::android::hardware::LazyServiceRegistrar::getInstance();
+        status = serviceRegistrar.registerService(provider, "external/0");
+    } else {
+        status = provider->registerAsService("external/0");
+    }
+
+    LOG_ALWAYS_FATAL_IF(status != android::OK, "Error while registering provider service: %d",
+                        status);
+
+    ::android::hardware::joinRpcThreadpool();
+
+    return 0;
+}
\ No newline at end of file