Revert of Revert "Revert 237280 "Remove TraceController""

content/browser/tracing/trace_controller_impl.h

Index: content/browser/tracing/trace_controller_impl.h
diff --git a/content/browser/tracing/trace_controller_impl.h b/content/browser/tracing/trace_controller_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..c058a04df15d6afc992bb5e0444ef9d3852f9a84
--- /dev/null
+++ b/content/browser/tracing/trace_controller_impl.h
@@ -0,0 +1,105 @@
+// 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.
+
+#ifndef CONTENT_BROWSER_TRACING_TRACE_CONTROLLER_IMPL_H_
+#define CONTENT_BROWSER_TRACING_TRACE_CONTROLLER_IMPL_H_
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/debug/trace_event.h"
+#include "base/lazy_instance.h"
+#include "content/public/browser/trace_controller.h"
+
+class CommandLine;
+
+namespace content {
+class TraceMessageFilter;
+
+class TraceControllerImpl : public TraceController {
+ public:
+  static TraceControllerImpl* GetInstance();
+
+  // TraceController implementation:
+  virtual bool BeginTracing(TraceSubscriber* subscriber,
+                            const std::string& category_patterns,
+                            base::debug::TraceLog::Options options) OVERRIDE;
+  virtual  bool EndTracingAsync(TraceSubscriber* subscriber) OVERRIDE;
+  virtual bool GetTraceBufferPercentFullAsync(
+      TraceSubscriber* subscriber) OVERRIDE;
+  virtual bool SetWatchEvent(TraceSubscriber* subscriber,
+                             const std::string& category_name,
+                             const std::string& event_name) OVERRIDE;
+  virtual bool CancelWatchEvent(TraceSubscriber* subscriber) OVERRIDE;
+  virtual void CancelSubscriber(TraceSubscriber* subscriber) OVERRIDE;
+  virtual bool GetKnownCategoryGroupsAsync(TraceSubscriber* subscriber)
+      OVERRIDE;
+
+ private:
+  typedef std::set<scoped_refptr<TraceMessageFilter> > FilterMap;
+
+  friend struct base::DefaultLazyInstanceTraits<TraceControllerImpl>;
+  friend class TraceMessageFilter;
+
+  TraceControllerImpl();
+  virtual ~TraceControllerImpl();
+
+  bool is_tracing_enabled() const {
+    return can_end_tracing();
+  }
+
+  bool can_end_tracing() const {
+    return is_tracing_ && pending_end_ack_count_ == 0;
+  }
+
+  // Can get Buffer Percent Full
+  bool can_get_buffer_percent_full() const {
+    return is_tracing_ &&
+        pending_end_ack_count_ == 0 &&
+        pending_bpf_ack_count_ == 0;
+  }
+
+  bool can_begin_tracing(TraceSubscriber* subscriber) const {
+    return !is_tracing_ &&
+        (subscriber_ == NULL || subscriber == subscriber_);
+  }
+
+  // Methods for use by TraceMessageFilter.
+
+  void AddFilter(TraceMessageFilter* filter);
+  void RemoveFilter(TraceMessageFilter* filter);
+  void OnTracingBegan(TraceSubscriber* subscriber);
+  void OnEndTracingAck(const std::vector<std::string>& known_category_groups);
+  void OnTraceDataCollected(
+      const scoped_refptr<base::RefCountedString>& events_str_ptr);
+  void OnTraceNotification(int notification);
+  void OnTraceBufferPercentFullReply(float percent_full);
+
+  // Callback of TraceLog::Flush() for the local trace.
+  void OnLocalTraceDataCollected(
+      const scoped_refptr<base::RefCountedString>& events_str_ptr,
+      bool has_more_events);
+
+  FilterMap filters_;
+  TraceSubscriber* subscriber_;
+  // Pending acks for EndTracingAsync:
+  int pending_end_ack_count_;
+  // Pending acks for GetTraceBufferPercentFullAsync:
+  int pending_bpf_ack_count_;
+  float maximum_bpf_;
+  bool is_tracing_;
+  bool is_get_category_groups_;
+  std::set<std::string> known_category_groups_;
+  std::string watch_category_;
+  std::string watch_name_;
+  base::debug::TraceLog::Options trace_options_;
+  base::debug::CategoryFilter category_filter_;
+
+  DISALLOW_COPY_AND_ASSIGN(TraceControllerImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_TRACING_TRACE_CONTROLLER_IMPL_H_