Introduce IKG into kernel-service to support incremental compilation.

runtime/include/dart_api.h

 /*
  * Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
 
 #ifndef RUNTIME_INCLUDE_DART_API_H_
 #define RUNTIME_INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 3119 matching lines @@
 DART_EXPORT Dart_KernelCompilationResult
 Dart_CompileToKernel(const char* script_uri);
 
 typedef struct {
   const char* uri;
   const char* source;
 } Dart_SourceFile;
 DART_EXPORT Dart_KernelCompilationResult
 Dart_CompileSourcesToKernel(const char* script_uri,
                             int source_files_count,
-                            Dart_SourceFile source_files[]);
+                            Dart_SourceFile source_files[],
+                            bool incremental_compile);
 
 #define DART_KERNEL_ISOLATE_NAME "kernel-service"
 
 /*
  * =======
  * Service
  * =======
  */
 
 #define DART_VM_SERVICE_ISOLATE_NAME "vm-service"
@@ skipping 197 matching lines @@
  *  compiled with DART_PRECOMPILED_RUNTIME).
  */
 DART_EXPORT bool Dart_IsPrecompiledRuntime();
 
 /**
  *  Print a native stack trace. Used for crash handling.
  */
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context);
 
 #endif /* INCLUDE_DART_API_H_ */ /* NOLINT */