Move stack trace extraction code out of TickSample::Init

src/profiler/tick-sample.h

 // Copyright 2013 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_PROFILER_TICK_SAMPLE_H_
 #define V8_PROFILER_TICK_SAMPLE_H_
 
 #include "include/v8.h"
 
 #include "src/base/platform/time.h"
@@ skipping 18 matching lines @@
   // include the runtime function we're calling. Externally exposed tick
   // samples don't care.
   enum RecordCEntryFrame { kIncludeCEntryFrame, kSkipCEntryFrame };
 
   TickSample()
       : state(OTHER),
         pc(NULL),
         external_callback_entry(NULL),
         frames_count(0),
         has_external_callback(false),
-        update_stats(true),
-        top_frame_type(StackFrame::NONE) {}
+        update_stats(true) {}
   void Init(Isolate* isolate, const v8::RegisterState& state,
             RecordCEntryFrame record_c_entry_frame, bool update_stats);
-  static void GetStackSample(Isolate* isolate, const v8::RegisterState& state,
+  static bool GetStackSample(Isolate* isolate, const v8::RegisterState& state,
                              RecordCEntryFrame record_c_entry_frame,
                              void** frames, size_t frames_limit,
                              v8::SampleInfo* sample_info);
   StateTag state;  // The state of the VM.
   Address pc;      // Instruction pointer.
   union {
     Address tos;   // Top stack value (*sp).
     Address external_callback_entry;
   };
   static const unsigned kMaxFramesCountLog2 = 8;
   static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1;
   Address stack[kMaxFramesCount];  // Call stack.
   base::TimeTicks timestamp;
   unsigned frames_count : kMaxFramesCountLog2;  // Number of captured frames.
   bool has_external_callback : 1;
   bool update_stats : 1;  // Whether the sample should update aggregated stats.
-  StackFrame::Type top_frame_type : 5;
 };
 
 
 #if defined(USE_SIMULATOR)
 class SimulatorHelper {
  public:
   // Returns true if register values were successfully retrieved
   // from the simulator, otherwise returns false.
   static bool FillRegisters(Isolate* isolate, v8::RegisterState* state);
 };
 #endif  // USE_SIMULATOR
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROFILER_TICK_SAMPLE_H_