Add configurable limit to allocations in heap profiler.

base/trace_event/trace_config.cc

Index: base/trace_event/trace_config.cc
diff --git a/base/trace_event/trace_config.cc b/base/trace_event/trace_config.cc
index e9e5a099893377e844be716845b0bbcfe90a2639..dc7536a7bfca7b7fc8f270050c2e9f4b85d626c5 100644
--- a/base/trace_event/trace_config.cc
+++ b/base/trace_event/trace_config.cc
@@ -50,6 +50,7 @@ const char kMemoryDumpConfigParam[] = "memory_dump_config";
 const char kTriggersParam[] = "triggers";
 const char kPeriodicIntervalParam[] = "periodic_interval_ms";
 const char kModeParam[] = "mode";
+const char kMinAllocationSize[] = "min_allocation_size_bytes";
 
 // Default configuration of memory dumps.
 const TraceConfig::MemoryDumpTriggerConfig kDefaultHeavyMemoryDumpTrigger = {
@@ -123,6 +124,7 @@ TraceConfig::TraceConfig(const TraceConfig& tc)
       enable_systrace_(tc.enable_systrace_),
       enable_argument_filter_(tc.enable_argument_filter_),
       memory_dump_config_(tc.memory_dump_config_),
+      min_allocation_size_bytes_(tc.min_allocation_size_bytes_),
       included_categories_(tc.included_categories_),
       disabled_categories_(tc.disabled_categories_),
       excluded_categories_(tc.excluded_categories_),
@@ -140,6 +142,7 @@ TraceConfig& TraceConfig::operator=(const TraceConfig& rhs) {
   enable_systrace_ = rhs.enable_systrace_;
   enable_argument_filter_ = rhs.enable_argument_filter_;
   memory_dump_config_ = rhs.memory_dump_config_;
+  min_allocation_size_bytes_ = rhs.min_allocation_size_bytes_;
   included_categories_ = rhs.included_categories_;
   disabled_categories_ = rhs.disabled_categories_;
   excluded_categories_ = rhs.excluded_categories_;
@@ -516,12 +519,24 @@ void TraceConfig::SetMemoryDumpConfig(
         StringToMemoryDumpLevelOfDetail(level_of_detail_str);
     memory_dump_config_.push_back(dump_config);
   }
+
+  int min_size_bytes = 0;
+  if (!memory_dump_config.GetInteger(kMinAllocationSize, &min_size_bytes)) {

[caseq, 2016/04/20 22:45:23]

Please also update MemoryDumpConfig in devtools' protocol.json
(https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...)

Also, please update the tests
(src/content/browser/devtools/protocol/tracing_handler_unittest.cc and, perhaps,
src/base/trace_event/trace_config_unittest.cc)

+    min_allocation_size_bytes_ = kDefaultMinAllocationSizeBytes;
+  } else {
+    if (min_size_bytes >= 0)

[caseq, 2016/04/20 22:45:23]

merge into the condition above?

+      min_allocation_size_bytes_ = static_cast<size_t>(min_size_bytes);
+    else
+      min_allocation_size_bytes_ = kDefaultMinAllocationSizeBytes;
+  }
+
 }
 
 void TraceConfig::SetDefaultMemoryDumpConfig() {
   memory_dump_config_.clear();
   memory_dump_config_.push_back(kDefaultHeavyMemoryDumpTrigger);
   memory_dump_config_.push_back(kDefaultLightMemoryDumpTrigger);
+  min_allocation_size_bytes_ = kDefaultMinAllocationSizeBytes;
 }
 
 void TraceConfig::ToDict(base::DictionaryValue& dict) const {