[compiler] Make OptimizedCompileJob agnostic from backend.

src/crankshaft/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
@@ skipping 12 matching lines @@
 class FunctionState;
 class HEnvironment;
 class HGraph;
 class HLoopInformation;
 class HOsrBuilder;
 class HTracer;
 class LAllocator;
 class LChunk;
 class LiveRange;
 
+class HCompilationJob final : public OptimizedCompileJob {
+ public:
+  explicit HCompilationJob(CompilationInfo* info)
+      : OptimizedCompileJob(info), graph_(nullptr), chunk_(nullptr) {}
+
+ protected:
+  virtual Status CreateGraphImpl();
+  virtual Status OptimizeGraphImpl();
+  virtual Status GenerateCodeImpl();
+
+ private:
+  HGraph* graph_;
+  LChunk* chunk_;
+};
 
 class HBasicBlock final : public ZoneObject {
  public:
   explicit HBasicBlock(HGraph* graph);
   ~HBasicBlock() { }
 
   // Simple accessors.
   int block_id() const { return block_id_; }
   void set_block_id(int id) { block_id_ = id; }
   HGraph* graph() const { return graph_; }
@@ skipping 3045 matching lines @@
   }
 
  private:
   HOptimizedGraphBuilder* builder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_