[NOT FOR LANDING] Detailed loading traces

content/browser/loader/resource_buffer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/loader/resource_buffer.h"
 
 #include <math.h>
 
 #include "base/logging.h"
+#include "base/trace_event/trace_event.h"
 
 namespace content {
 
 // A circular buffer allocator.
 //
 // We keep track of the starting offset (alloc_start_) and the ending offset
 // (alloc_end_).  There are two layouts to keep in mind:
 //
 // #1:
 //    ------------[XXXXXXXXXXXXXXXXXXXXXXX]----
@@ skipping 17 matching lines @@
       alloc_start_(-1),
       alloc_end_(-1) {
 }
 
 ResourceBuffer::~ResourceBuffer() {
 }
 
 bool ResourceBuffer::Initialize(int buffer_size,
                                 int min_allocation_size,
                                 int max_allocation_size) {
+  TRACE_EVENT0("toplevel", "ResourceBuffer::Initialize(");
+
   CHECK(!IsInitialized());
 
   // It would be wasteful if these are not multiples of min_allocation_size.
   CHECK_EQ(0, buffer_size % min_allocation_size);
   CHECK_EQ(0, max_allocation_size % min_allocation_size);
 
   buf_size_ = buffer_size;
   min_alloc_size_ = min_allocation_size;
   max_alloc_size_ = max_allocation_size;
 
@@ skipping 16 matching lines @@
     return true;
 
   int diff = alloc_end_ - alloc_start_;
   if (diff > 0)
     return (buf_size_ - diff) >= min_alloc_size_;
 
   return -diff >= min_alloc_size_;
 }
 
 char* ResourceBuffer::Allocate(int* size) {
+  TRACE_EVENT0("toplevel", "ResourceBuffer::Allocate");
   CHECK(CanAllocate());
 
   int alloc_offset = 0;
   int alloc_size;
 
   if (alloc_start_ == -1) {
     // This is the first allocation.
     alloc_start_ = 0;
     alloc_end_ = buf_size_;
     alloc_size = buf_size_;
@@ skipping 71 matching lines @@
     CHECK(alloc_sizes_.empty());
     alloc_start_ = -1;
     alloc_end_ = -1;
   } else if (alloc_start_ == buf_size_) {
     CHECK(!alloc_sizes_.empty());
     alloc_start_ = 0;
   }
 }
 
 }  // namespace content