Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/profiler/cpu-profiler.h b/src/profiler/cpu-profiler.h
index e5ef0ac..1a1249c 100644
--- a/src/profiler/cpu-profiler.h
+++ b/src/profiler/cpu-profiler.h
@@ -139,7 +139,7 @@
   void Enqueue(const CodeEventsContainer& event);
 
   // Puts current stack into tick sample events buffer.
-  void AddCurrentStack(Isolate* isolate);
+  void AddCurrentStack(Isolate* isolate, bool update_stats = false);
   void AddDeoptStack(Isolate* isolate, Address from, int fp_to_sp_delta);
 
   // Tick sample events are filled directly in the buffer of the circular
@@ -168,8 +168,7 @@
   ProfileGenerator* generator_;
   Sampler* sampler_;
   base::Atomic32 running_;
-  // Sampling period in microseconds.
-  const base::TimeDelta period_;
+  const base::TimeDelta period_;  // Samples & code events processing period.
   LockedQueue<CodeEventsContainer> events_buffer_;
   static const size_t kTickSampleBufferSize = 1 * MB;
   static const size_t kTickSampleQueueLength =
@@ -205,6 +204,7 @@
   virtual ~CpuProfiler();
 
   void set_sampling_interval(base::TimeDelta value);
+  void CollectSample();
   void StartProfiling(const char* title, bool record_samples = false);
   void StartProfiling(String* title, bool record_samples);
   CpuProfile* StopProfiling(const char* title);