Revert "Added isolate + thread high watermark tracking to Observatory"

runtime/vm/zone.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/zone.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/handles_impl.h"
@@ skipping 25 matching lines @@
   uword address(int n) { return reinterpret_cast<uword>(this) + n; }
 
   static void Delete(Segment* segment) { free(segment); }
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Segment);
 };
 
 
 void Zone::Segment::DeleteSegmentList(Segment* head) {
   Segment* current = head;
-  Thread* current_thread = Thread::Current();
   while (current != NULL) {
-    if (current_thread != NULL) {
-      // TODO(bkonyi) Handle special case of segment deletion within native
-      // isolate.
-      current_thread->DecrementMemoryUsage(current->size());
-    }
     Segment* next = current->next();
 #ifdef DEBUG
     // Zap the entire current segment (including the header).
     memset(current, kZapDeletedByte, current->size());
 #endif
     Segment::Delete(current);
     current = next;
   }
 }
 
 
 Zone::Segment* Zone::Segment::New(intptr_t size, Zone::Segment* next) {
   ASSERT(size >= 0);
   Segment* result = reinterpret_cast<Segment*>(malloc(size));
   if (result == NULL) {
     OUT_OF_MEMORY();
   }
   ASSERT(Utils::IsAligned(result->start(), Zone::kAlignment));
 #ifdef DEBUG
   // Zap the entire allocated segment (including the header).
   memset(result, kZapUninitializedByte, size);
 #endif
   result->next_ = next;
   result->size_ = size;
-  if (Thread::Current() != NULL) {
-    // TODO(bkonyi) Handle special case of segment creation within native
-    // isolate.
-    Thread::Current()->IncrementMemoryUsage(size);
-  }
   return result;
 }
 
 
 Zone::Zone()
     : initial_buffer_(buffer_, kInitialChunkSize),
       position_(initial_buffer_.start()),
       limit_(initial_buffer_.end()),
       head_(NULL),
       large_segments_(NULL),
@@ skipping 222 matching lines @@
   ASSERT(thread()->zone() == &zone_);
   thread()->set_zone(zone_.previous_);
   if (FLAG_trace_zones) {
     OS::PrintErr("*** Deleting Stack zone 0x%" Px "(0x%" Px ")\n",
                  reinterpret_cast<intptr_t>(this),
                  reinterpret_cast<intptr_t>(&zone_));
   }
 }
 
 }  // namespace dart