Introduce a v8::Platform class that bundles embedder callbacks

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 7966e2c57c95d0a987db6c15f302e3417ae22895..214b7c2d6cf8a511931e95ba1124118abf49d872 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -40,6 +40,9 @@
 #include "counters.h"
 #include "cpu-profiler.h"
 #include "debug.h"
+#ifdef V8_USE_DEFAULT_PLATFORM
+#include "default-platform.h"
+#endif
 #include "deoptimizer.h"
 #include "execution.h"
 #include "global-handles.h"
@@ -5047,11 +5050,32 @@ static void* ExternalValue(i::Object* obj) {
 // --- E n v i r o n m e n t ---
 
 
+void v8::V8::InitializePlatform(Platform* platform) {
+#ifdef V8_USE_DEFAULT_PLATFORM
+  FATAL("Can't override v8::Platform when using default implementation");
+#else
+  i::V8::InitializePlatform(platform);
+#endif
+}
+
+
+void v8::V8::ShutdownPlatform() {
+#ifdef V8_USE_DEFAULT_PLATFORM
+  FATAL("Can't override v8::Platform when using default implementation");
+#else
+  i::V8::ShutdownPlatform();
+#endif
+}
+
+
 bool v8::V8::Initialize() {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   if (isolate != NULL && isolate->IsInitialized()) {
     return true;
   }
+#ifdef V8_USE_DEFAULT_PLATFORM
+  i::V8::InitializePlatform(new i::DefaultPlatform);
+#endif
   return InitializeHelper(isolate);
 }
 
@@ -5116,6 +5140,12 @@ bool v8::V8::Dispose() {
     return false;
   }
   i::V8::TearDown();
+#ifdef V8_USE_DEFAULT_PLATFORM
+  i::DefaultPlatform* platform =
+      static_cast<i::DefaultPlatform*>(i::V8::GetCurrentPlatform());
+  i::V8::ShutdownPlatform();
+  delete platform;
+#endif
   return true;
 }