Introduce a v8::Platform class that bundles embedder callbacks

src/default-platform.h

Index: src/default-platform.h
diff --git a/src/hydrogen-canonicalize.h b/src/default-platform.h
similarity index 76%
copy from src/hydrogen-canonicalize.h
copy to src/default-platform.h
index d2b289bc2124d2634c48a50b5c202c2941886b8c..45a6056ed61415bfbcd1d2a0910f67dbae3f5c78 100644
--- a/src/hydrogen-canonicalize.h
+++ b/src/default-platform.h
@@ -25,27 +25,31 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_HYDROGEN_CANONICALIZE_H_
-#define V8_HYDROGEN_CANONICALIZE_H_
+#ifndef V8_DEFAULT_PLATFORM_H_
+#define V8_DEFAULT_PLATFORM_H_
 
-#include "hydrogen.h"
+#include "v8.h"
 
 namespace v8 {
 namespace internal {
 
-
-class HCanonicalizePhase : public HPhase {
+class DefaultPlatform : public Platform {
  public:
-  explicit HCanonicalizePhase(HGraph* graph)
-      : HPhase("H_Canonicalize", graph) { }
+  DefaultPlatform();
+  virtual ~DefaultPlatform();
 
-  void Run();
+  // v8::Platform implementation.
+  virtual void CallOnBackgroundThread(Task *task,
+                                      bool task_is_slow) V8_OVERRIDE;
+  virtual void CallOnForegroundThread(v8::Isolate *isolate,
+                                      Task *task) V8_OVERRIDE;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(HCanonicalizePhase);
+  DISALLOW_COPY_AND_ASSIGN(DefaultPlatform);
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // V8_HYDROGEN_CANONICALIZE_H_
+
+#endif  // V8_DEFAULT_PLATFORM_H_