Add Observatory to sky dart_controller

sky/engine/core/script/dart_debugger.cc

Index: sky/engine/core/script/dart_debugger.cc
diff --git a/mojo/dart/embedder/dart_debugger.cc b/sky/engine/core/script/dart_debugger.cc
similarity index 97%
copy from mojo/dart/embedder/dart_debugger.cc
copy to sky/engine/core/script/dart_debugger.cc
index 31e9ee4b5fb9a6534eccf618e5a56dd98842cd8c..422b6de4f96309322abbbe03169ff95f3c6398d7 100644
--- a/mojo/dart/embedder/dart_debugger.cc
+++ b/sky/engine/core/script/dart_debugger.cc
@@ -7,10 +7,9 @@
 #include "dart/runtime/include/dart_api.h"
 #include "dart/runtime/include/dart_debugger_api.h"
 #include "dart/runtime/include/dart_native_api.h"
-#include "mojo/dart/embedder/dart_debugger.h"
+#include "dart_debugger.h"
 
-namespace mojo {
-namespace dart {
+namespace blink {
 
 void DartDebuggerIsolate::MessageLoop() {
   MonitorLocker ml(&monitor_);
@@ -141,5 +140,4 @@ void DartDebugger::RemoveIsolate(Dart_IsolateId id) {
 base::Lock* DartDebugger::lock_ = nullptr;
 std::vector<DartDebuggerIsolate*> DartDebugger::isolates_;
 
-}  // namespace apps
-}  // namespace mojo
+}  // namespace blink