[compiler] Move tracing from backends to compiler.

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 15 matching lines @@
 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) {}
+      : OptimizedCompileJob(info, "Crankshaft"),
+        graph_(nullptr),
+        chunk_(nullptr) {}
 
  protected:
   virtual Status CreateGraphImpl();
   virtual Status OptimizeGraphImpl();
   virtual Status GenerateCodeImpl();
 
  private:
   HGraph* graph_;
   LChunk* chunk_;
 };
@@ skipping 3055 matching lines @@
   }
 
  private:
   HOptimizedGraphBuilder* builder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_