Introduce IKG into kernel-service to support incremental compilation.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "lib/stacktrace.h"
 #include "platform/assert.h"
@@ skipping 5850 matching lines @@
 #ifdef DART_PRECOMPILED_RUNTIME
   Dart_KernelCompilationResult result;
   result.status = Dart_KernelCompilationStatus_Unknown;
   result.error = strdup("Dart_CompileToKernel is unsupported.");
   return result;
 #else
   return KernelIsolate::CompileToKernel(script_uri);
 #endif
 }
 
+static Dart_KernelCompilationResult CompileSourcesToKernel(
+    const char* script_uri,
+    int source_files_count,
+    Dart_SourceFile sources[],
+    bool incremental) {
+#ifdef DART_PRECOMPILED_RUNTIME
+  Dart_KernelCompilationResult result;
+  result.status = Dart_KernelCompilationStatus_Unknown;
+  result.error = strdup("Dart_CompileSourcesToKernel is unsupported.");
+  return result;
+#else
+  return KernelIsolate::CompileToKernel(script_uri, source_files_count, sources,
+                                        incremental);
+#endif
+}
+
 DART_EXPORT Dart_KernelCompilationResult
 Dart_CompileSourcesToKernel(const char* script_uri,
                             int source_files_count,
                             Dart_SourceFile sources[]) {
-#ifdef DART_PRECOMPILED_RUNTIME
-  Dart_KernelCompilationResult result;
-  result.status = Dart_KernelCompilationStatus_Unknown;
-  result.error = strdup("Dart_CompileSourcesToKernel is unsupported.");
-  return result;
-#else
-  return KernelIsolate::CompileToKernel(script_uri, source_files_count,
-                                        sources);
-#endif
+  return CompileSourcesToKernel(script_uri, source_files_count, sources,
+                                false /* incremental */);
+}
+
+DART_EXPORT Dart_KernelCompilationResult
+Dart_IncrementallyCompileSourcesToKernel(const char* script_uri,
+                                         int source_files_count,
+                                         Dart_SourceFile sources[]) {
+  return CompileSourcesToKernel(script_uri, source_files_count, sources,
+                                true /* incremental */);
 }
 
 // --- Service support ---
 
 DART_EXPORT bool Dart_IsServiceIsolate(Dart_Isolate isolate) {
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
   return ServiceIsolate::IsServiceIsolate(iso);
 }
 
 DART_EXPORT Dart_Port Dart_ServiceWaitForLoadPort() {
@@ skipping 876 matching lines @@
 #endif
 }
 
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context) {
 #ifndef PRODUCT
   Profiler::DumpStackTrace(context);
 #endif
 }
 
 }  // namespace dart