Do not record CPU profile samples when stack collection is failed.

test/cctest/test-profile-generator.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 410 matching lines @@
   CodeEntry* entry3 = profiles.NewCodeEntry(i::Logger::FUNCTION_TAG, "ccc");
   generator.code_map()->AddCode(ToAddress(0x1500), entry1, 0x200);
   generator.code_map()->AddCode(ToAddress(0x1700), entry2, 0x100);
   generator.code_map()->AddCode(ToAddress(0x1900), entry3, 0x50);
 
   // We are building the following calls tree:
   //                    -> aaa #3           - sample1
   // (root)#1 -> aaa #2 -> bbb #4 -> ccc #5 - sample2
   //                    -> ccc #6 -> aaa #7 - sample3
   TickSample sample1;
+  sample1.timestamp = v8::base::TimeTicks::HighResolutionNow();
   sample1.pc = ToAddress(0x1600);
   sample1.stack[0] = ToAddress(0x1510);
   sample1.frames_count = 1;
   generator.RecordTickSample(sample1);
   TickSample sample2;
+  sample2.timestamp = v8::base::TimeTicks::HighResolutionNow();
   sample2.pc = ToAddress(0x1925);
   sample2.stack[0] = ToAddress(0x1780);
   sample2.stack[1] = ToAddress(0x10000);  // non-existent.
   sample2.stack[2] = ToAddress(0x1620);
   sample2.frames_count = 3;
   generator.RecordTickSample(sample2);
   TickSample sample3;
+  sample3.timestamp = v8::base::TimeTicks::HighResolutionNow();
   sample3.pc = ToAddress(0x1510);
   sample3.stack[0] = ToAddress(0x1910);
   sample3.stack[1] = ToAddress(0x1610);
   sample3.frames_count = 2;
   generator.RecordTickSample(sample3);
 
   CpuProfile* profile = profiles.StopProfiling("");
   unsigned nodeId = 1;
   CheckNodeIds(profile->top_down()->root(), &nodeId);
   CHECK_EQ(7u, nodeId - 1);
@@ skipping 265 matching lines @@
   CHECK(const_cast<v8::CpuProfileNode*>(current));
 
   current = PickChild(current, "TryFinally");
   CHECK(const_cast<v8::CpuProfileNode*>(current));
   CHECK(!strcmp("TryFinallyStatement", current->GetBailoutReason()));
 
   current = PickChild(current, "Debugger");
   CHECK(const_cast<v8::CpuProfileNode*>(current));
   CHECK(!strcmp("DebuggerStatement", current->GetBailoutReason()));
 }