VM: Re-format to use at most one newline between functions

runtime/vm/zone_text_buffer.cc

 // Copyright (c) 2017, 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_text_buffer.h"
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "platform/utils.h"
 #include "vm/os.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 ZoneTextBuffer::ZoneTextBuffer(Zone* zone, intptr_t initial_capacity)
     : zone_(zone), buffer_(NULL), length_(0), capacity_(0) {
   ASSERT(initial_capacity > 0);
   buffer_ = reinterpret_cast<char*>(zone->Alloc<char>(initial_capacity));
   capacity_ = initial_capacity;
   buffer_[length_] = '\0';
 }
 
-
 intptr_t ZoneTextBuffer::Printf(const char* format, ...) {
   va_list args;
   va_start(args, format);
   intptr_t remaining = capacity_ - length_;
   ASSERT(remaining >= 0);
   intptr_t len = OS::VSNPrint(buffer_ + length_, remaining, format, args);
   va_end(args);
   if (len >= remaining) {
     EnsureCapacity(len);
     remaining = capacity_ - length_;
     ASSERT(remaining > len);
     va_list args2;
     va_start(args2, format);
     intptr_t len2 = OS::VSNPrint(buffer_ + length_, remaining, format, args2);
     va_end(args2);
     ASSERT(len == len2);
   }
   length_ += len;
   buffer_[length_] = '\0';
   return len;
 }
 
-
 void ZoneTextBuffer::AddString(const char* s) {
   Printf("%s", s);
 }
 
-
 void ZoneTextBuffer::EnsureCapacity(intptr_t len) {
   intptr_t remaining = capacity_ - length_;
   if (remaining <= len) {
     const int kBufferSpareCapacity = 64;  // Somewhat arbitrary.
     // TODO(turnidge): do we need to guard against overflow or other
     // security issues here? Text buffers are used by the debugger
     // to send user-controlled data (e.g. values of string variables) to
     // the debugger front-end.
     intptr_t new_capacity = capacity_ + len + kBufferSpareCapacity;
     buffer_ = zone_->Realloc<char>(buffer_, capacity_, new_capacity);
     capacity_ = new_capacity;
   }
 }
 
 }  // namespace dart