Reland r17877 - Introduce a v8::Platform class that bundles embedder callbacks

src/default-platform.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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-#ifndef V8_HYDROGEN_MARK_UNREACHABLE_H_
-#define V8_HYDROGEN_MARK_UNREACHABLE_H_
+#include "v8.h"
 
-#include "hydrogen.h"
+#include "default-platform.h"
 
 namespace v8 {
 namespace internal {
 
 
-class HMarkUnreachableBlocksPhase : public HPhase {
- public:
-  explicit HMarkUnreachableBlocksPhase(HGraph* graph)
-      : HPhase("H_Mark unrechable blocks", graph) { }
+DefaultPlatform::DefaultPlatform() {}
 
-  void Run();
 
- private:
-  void MarkUnreachableBlocks();
+DefaultPlatform::~DefaultPlatform() {}
 
-  DISALLOW_COPY_AND_ASSIGN(HMarkUnreachableBlocksPhase);
-};
+void DefaultPlatform::CallOnBackgroundThread(Task *task,
+                                             ExpectedRuntime expected_runtime) {
+  // TODO(jochen): implement.
+  task->Run();
+  delete task;
+}
+
+
+void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
+  // TODO(jochen): implement.
+  task->Run();
+  delete task;
+}
 
 
 } }  // namespace v8::internal
-
-#endif  // V8_HYDROGEN_MARK_UNREACHABLE_H_