Revert 213299 "Add the tracing manager"

trunk/src/chrome/browser/feedback/tracing_manager.cc

-// Copyright 2013 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 "chrome/browser/feedback/tracing_manager.h"
-
-#include "base/bind.h"
-#include "base/prefs/pref_service.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/browser/feedback/feedback_util.h"
-#include "chrome/common/pref_names.h"
-#include "content/public/browser/trace_controller.h"
-
-namespace {
-// Only once trace manager can exist at a time.
-TracingManager* g_tracing_manager = NULL;
-// Trace IDs start at 1 and increase.
-int g_next_trace_id = 1;
-}
-
-TracingManager::TracingManager()
-    : current_trace_id_(0),
-      weak_ptr_factory_(this) {
-  DCHECK(!g_tracing_manager);
-  g_tracing_manager = this;
-  StartTracing();
-}
-
-TracingManager::~TracingManager() {
-  DCHECK(g_tracing_manager == this);
-  g_tracing_manager = NULL;
-}
-
-int TracingManager::RequestTrace() {
-  // Return the current trace if one is being collected.
-  if (current_trace_id_)
-    return current_trace_id_;
-
-  current_trace_id_ = g_next_trace_id;
-  ++g_next_trace_id;
-  content::TraceController::GetInstance()->EndTracingAsync(this);
-  return current_trace_id_;
-}
-
-bool TracingManager::GetTraceData(int id, const TraceDataCallback& callback) {
-  // If a trace is being collected currently, send it via callback when
-  // complete.
-  if (current_trace_id_) {
-    // Only allow one trace data request at a time.
-    if (trace_callback_.is_null()) {
-      trace_callback_ = callback;
-      return true;
-    } else {
-      return false;
-    }
-  } else {
-    std::map<int, scoped_refptr<base::RefCountedString> >::iterator data =
-        trace_data_.find(id);
-    if (data == trace_data_.end())
-      return false;
-
-    // Always return the data asychronously, so the behavior is consistant.
-    base::MessageLoopProxy::current()->PostTask(
-        FROM_HERE,
-        base::Bind(callback, data->second));
-    return true;
-  }
-}
-
-void TracingManager::DiscardTraceData(int id) {
-  trace_data_.erase(id);
-
-  // If the trace is discarded before it is complete, clean up the accumulators.
-  if (id == current_trace_id_) {
-    current_trace_id_ = 0;
-    data_ = "";
-
-    // If the trace has already been requested, provide an empty string.
-    if (!trace_callback_.is_null()) {
-      trace_callback_.Run(scoped_refptr<base::RefCountedString>());
-      trace_callback_.Reset();
-    }
-  }
-}
-
-void TracingManager::StartTracing() {
-  content::TraceController::GetInstance()->BeginTracing(
-      this, "-test_*",
-      base::debug::TraceLog::RECORD_CONTINUOUSLY);
-}
-
-void TracingManager::OnEndTracingComplete() {
-  if (!current_trace_id_)
-    return;
-
-  std::string output_val;
-  FeedbackUtil::ZipString(data_, &output_val);
-
-  scoped_refptr<base::RefCountedString> output;
-  output->TakeString(&output_val);
-
-  trace_data_[current_trace_id_] = output;
-
-  if (!trace_callback_.is_null()) {
-    trace_callback_.Run(output);
-    trace_callback_.Reset();
-  }
-
-  current_trace_id_ = 0;
-  data_ = "";
-
-  // Tracing has to be restarted asynchronous, so the TracingController can
-  // clean up.
-  base::MessageLoopProxy::current()->PostTask(
-      FROM_HERE,
-      base::Bind(&TracingManager::StartTracing,
-                 weak_ptr_factory_.GetWeakPtr()));
-}
-
-void TracingManager::OnTraceDataCollected(
-    const scoped_refptr<base::RefCountedString>& trace_fragment) {
-  if (current_trace_id_)
-    data_ += trace_fragment->data();
-}
-
-// static
-scoped_ptr<TracingManager> TracingManager::Create() {
-  if (g_tracing_manager)
-    return scoped_ptr<TracingManager>();
-  return scoped_ptr<TracingManager>(new TracingManager());
-}
-
-TracingManager* TracingManager::Get() {
-  return g_tracing_manager;
-}