Revert 202620 "Collect tab timing information for use in telemen..."

trunk/src/content/renderer/stats_collection_controller.cc

Index: trunk/src/content/renderer/stats_collection_controller.cc
===================================================================
--- trunk/src/content/renderer/stats_collection_controller.cc	(revision 202661)
+++ trunk/src/content/renderer/stats_collection_controller.cc	(working copy)
@@ -1,159 +0,0 @@
-// 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 "content/renderer/stats_collection_controller.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/json/json_writer.h"
-#include "base/metrics/histogram.h"
-#include "base/metrics/statistics_recorder.h"
-#include "base/string_util.h"
-#include "content/common/child_process_messages.h"
-#include "content/renderer/render_view_impl.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
-
-using webkit_glue::CppArgumentList;
-using webkit_glue::CppVariant;
-
-namespace content {
-
-namespace {
-
-bool CurrentRenderViewImpl(RenderViewImpl** out) {
-  WebKit::WebFrame* web_frame = WebKit::WebFrame::frameForCurrentContext();
-  if (!web_frame)
-    return false;
-
-  WebKit::WebView* web_view = web_frame->view();
-  if (!web_view)
-    return false;
-
-  RenderViewImpl* render_view_impl =
-      RenderViewImpl::FromWebView(web_view);
-  if (!render_view_impl)
-    return false;
-
-  *out = render_view_impl;
-  return true;
-}
-
-// Encodes a WebContentsLoadTime as JSON.
-// Input:
-// - |load_start_time| - time at which page load started.
-// - |load_stop_time| - time at which page load stopped.
-// - |result| - returned JSON.
-// Example return value:
-// {'load_start_ms': 1, 'load_duration_ms': 2.5}
-// either value may be null if a web contents hasn't fully loaded.
-// load_start_ms is represented as milliseconds since system boot.
-void ConvertLoadTimeToJSON(
-    const base::TimeTicks& load_start_time,
-    const base::TimeTicks& load_stop_time,
-    std::string *result) {
-  DictionaryValue item;
-
-  if (load_start_time.is_null()) {
-     item.Set("load_start_ms", Value::CreateNullValue());
-  } else {
-    // This code relies on an implementation detail of TimeTicks::Now() - that
-    // its return value happens to coincide with the system uptime value in
-    // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.  See comments
-    // in base::SysInfo::Uptime().
-    item.SetDouble("load_start_ms", load_start_time.ToInternalValue() / 1000);
-  }
-  if (load_stop_time.is_null() || load_stop_time.is_null()) {
-    item.Set("load_duration_ms", Value::CreateNullValue());
-  } else {
-    item.SetDouble("load_duration_ms",
-        (load_stop_time - load_start_time).InMilliseconds());
-  }
-  base::JSONWriter::Write(&item, result);
-}
-
-}  // namespace
-
-StatsCollectionController::StatsCollectionController()
-    : sender_(NULL) {
-  BindCallback("getHistogram",
-               base::Bind(&StatsCollectionController::GetHistogram,
-                          base::Unretained(this)));
-  BindCallback("getBrowserHistogram",
-               base::Bind(&StatsCollectionController::GetBrowserHistogram,
-                          base::Unretained(this)));
-  BindCallback("tabLoadTiming",
-               base::Bind(
-                  &StatsCollectionController::GetTabLoadTiming,
-                  base::Unretained(this)));
-}
-
-void StatsCollectionController::GetHistogram(const CppArgumentList& args,
-                                            CppVariant* result) {
-  if (args.size() != 1) {
-    result->SetNull();
-    return;
-  }
-  base::HistogramBase* histogram =
-      base::StatisticsRecorder::FindHistogram(args[0].ToString());
-  std::string output;
-  if (!histogram) {
-    output = "{}";
-  } else {
-    histogram->WriteJSON(&output);
-  }
-  result->Set(output);
-}
-
-void StatsCollectionController::GetBrowserHistogram(const CppArgumentList& args,
-                                                   CppVariant* result) {
-  if (args.size() != 1) {
-    result->SetNull();
-    return;
-  }
-
-  if (!sender_) {
-    NOTREACHED();
-    result->SetNull();
-    return;
-  }
-
-  std::string histogram_json;
-  sender_->Send(new ChildProcessHostMsg_GetBrowserHistogram(
-      args[0].ToString(), &histogram_json));
-  result->Set(histogram_json);
-}
-
-void StatsCollectionController::GetTabLoadTiming(
-    const CppArgumentList& args,
-    CppVariant* result) {
-  if (!sender_) {
-    NOTREACHED();
-    result->SetNull();
-    return;
-  }
-
-  RenderViewImpl *render_view_impl = NULL;
-  if (!CurrentRenderViewImpl(&render_view_impl)) {
-    NOTREACHED();
-    result->SetNull();
-    return;
-  }
-
-  StatsCollectionObserver* observer =
-      render_view_impl->GetStatsCollectionObserver();
-  if (!observer) {
-    NOTREACHED();
-    result->SetNull();
-    return;
-  }
-
-  std::string tab_timing_json;
-  ConvertLoadTimeToJSON(
-      observer->load_start_time(), observer->load_stop_time(),
-      &tab_timing_json);
-  result->Set(tab_timing_json);
-}
-
-}  // namespace content