Autoimport items from kotlinx.android.synthetic on completion

idea/idea-core/src/org/jetbrains/kotlin/idea/core/KotlinIndicesHelper.kt

@@ -33,6 +33,7 @@ import org.jetbrains.kotlin.idea.caches.resolve.getJavaFieldDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.getJavaMethodDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.resolveImportReference
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptor
+import org.jetbrains.kotlin.idea.core.extension.KotlinIndicesHelperExtension
 import org.jetbrains.kotlin.idea.imports.importableFqName
 import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
 import org.jetbrains.kotlin.idea.stubindex.*
@@ -145,7 +146,18 @@ public class KotlinIndicesHelper(
                 }
                 .flatMap { index.get(it, project, scope).asSequence() }
 
-        return findSuitableExtensions(declarations, receiverTypes, callTypeAndReceiver.callType)
+        val suitableExtensions = findSuitableExtensions(declarations, receiverTypes, callTypeAndReceiver.callType)
+
+        val additionalDescriptors = ArrayList<CallableDescriptor>(0)
+
+        for (extension in KotlinIndicesHelperExtension.getInstances(project)) {
+            extension.appendExtensionCallables(additionalDescriptors, moduleDescriptor, receiverTypes, nameFilter)
+        }
+
+        return if (additionalDescriptors.isNotEmpty())
+            suitableExtensions + additionalDescriptors
+        else
+            suitableExtensions
     }
 
     private fun MutableCollection<String>.addTypeNames(type: KotlinType) {

idea/idea-core/src/org/jetbrains/kotlin/idea/core/extension/KotlinIndicesHelperExtension.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * 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 org.jetbrains.kotlin.idea.core.extension
+
+import org.jetbrains.kotlin.descriptors.CallableDescriptor
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.extensions.ProjectExtensionDescriptor
+import org.jetbrains.kotlin.types.KotlinType
+
+interface KotlinIndicesHelperExtension {
+    companion object : ProjectExtensionDescriptor<KotlinIndicesHelperExtension>(
+            "org.jetbrains.kotlin.kotlinIndicesHelperExtension", KotlinIndicesHelperExtension::class.java)
+
+    fun appendExtensionCallables(
+            consumer: MutableList<in CallableDescriptor>,
+            moduleDescriptor: ModuleDescriptor,
+            receiverTypes: Collection<KotlinType>,
+            nameFilter: (String) -> Boolean)
+}