Expose all reusable task manager view code so it can be used by Mac

chrome/browser/ui/task_manager/task_manager_table_model.cc

Index: chrome/browser/ui/task_manager/task_manager_table_model.cc
diff --git a/chrome/browser/ui/task_manager/task_manager_table_model.cc b/chrome/browser/ui/task_manager/task_manager_table_model.cc
new file mode 100644
index 0000000000000000000000000000000000000000..90f8865268757317063c0a49b6b4998fc7e2acc0
--- /dev/null
+++ b/chrome/browser/ui/task_manager/task_manager_table_model.cc
@@ -0,0 +1,721 @@
+// Copyright 2015 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/ui/task_manager/task_manager_table_model.h"
+
+#include "base/i18n/number_formatting.h"
+#include "base/i18n/rtl.h"
+#include "base/prefs/scoped_user_pref_update.h"
+#include "base/process/process_handle.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/task_management/task_manager_interface.h"
+#include "chrome/browser/ui/task_manager/task_manager_columns.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/nacl/browser/nacl_browser.h"
+#include "content/public/common/result_codes.h"
+#include "third_party/WebKit/public/web/WebCache.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/models/table_model_observer.h"
+#include "ui/base/text/bytes_formatting.h"
+
+namespace task_management {
+
+namespace {
+
+#if defined(OS_MACOSX)
+// Match Activity Monitor's default refresh rate.
+const int64 kRefreshTimeMS = 2000;
+
+// Activity Monitor shows %cpu with one decimal digit -- be consistent with
+// that.
+const char kCpuTextFormatString[] = "%.1f";
+#else
+const int64 kRefreshTimeMS = 1000;
+const char kCpuTextFormatString[] = "%.0f";
+#endif  // defined(OS_MACOSX)
+
+// The columns that are shared by a group will show the value of the column
+// only once per group.
+bool IsSharedByGroup(int column_id) {
+  switch (column_id) {
+    case IDS_TASK_MANAGER_PRIVATE_MEM_COLUMN:
+    case IDS_TASK_MANAGER_SHARED_MEM_COLUMN:
+    case IDS_TASK_MANAGER_PHYSICAL_MEM_COLUMN:
+    case IDS_TASK_MANAGER_CPU_COLUMN:
+    case IDS_TASK_MANAGER_PROCESS_ID_COLUMN:
+    case IDS_TASK_MANAGER_JAVASCRIPT_MEMORY_ALLOCATED_COLUMN:
+    case IDS_TASK_MANAGER_VIDEO_MEMORY_COLUMN:
+    case IDS_TASK_MANAGER_SQLITE_MEMORY_USED_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_NACL_DEBUG_STUB_PORT_COLUMN:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// Used to sort various column values.
+template <class T>
+int ValueCompare(T value1, T value2) {
+  if (value1 == value2)
+    return 0;
+  return value1 < value2 ? -1 : 1;
+}
+
+// Used when one or both of the results to compare are unavailable.
+int OrderUnavailableValue(bool v1, bool v2) {
+  if (!v1 && !v2)
+    return 0;
+  return v1 ? 1 : -1;
+}
+
+}  // namespace
+
+// A class to stringify the task manager's values into string16s and to
+// cache the common strings that will be reused many times like "N/A" and so on.
+class TaskManagerValuesStringifier {
+ public:
+  TaskManagerValuesStringifier()
+      : n_a_string_(l10n_util::GetStringUTF16(IDS_TASK_MANAGER_NA_CELL_TEXT)),
+        zero_string_(base::ASCIIToUTF16("0")),
+        asterisk_string_(base::ASCIIToUTF16("*")),
+        unknown_string_(l10n_util::GetStringUTF16(
+            IDS_TASK_MANAGER_UNKNOWN_VALUE_TEXT)) {
+  }
+
+  ~TaskManagerValuesStringifier() {}
+
+  base::string16 GetCpuUsageText(double cpu_usage) {
+    return base::UTF8ToUTF16(base::StringPrintf(kCpuTextFormatString,
+                                                cpu_usage));
+  }
+
+  base::string16 GetMemoryUsageText(int64 memory_usage, bool has_duplicates) {
+    if (memory_usage == -1)
+      return n_a_string_;
+
+#if defined(OS_MACOSX)
+    // System expectation is to show "100 kB", "200 MB", etc.
+    // TODO(thakis): [This TODO has been taken as is from the old task manager]:
+    // Switch to metric units (as opposed to powers of two).
+    base::string16 memory_text = ui::FormatBytes(memory_usage);
+#else
+    base::string16 memory_text = base::FormatNumber(memory_usage / 1024);
+    // Adjust number string if necessary.
+    base::i18n::AdjustStringForLocaleDirection(&memory_text);
+    memory_text = l10n_util::GetStringFUTF16(IDS_TASK_MANAGER_MEM_CELL_TEXT,
+                                             memory_text);
+#endif  // defined(OS_MACOSX)
+
+    if (has_duplicates)
+      memory_text += asterisk_string_;
+
+    return memory_text;
+  }
+
+  base::string16 GetIdleWakeupsText(int idle_wakeups) {
+    if (idle_wakeups == -1)
+      return n_a_string_;
+
+    return base::FormatNumber(idle_wakeups);
+  }
+
+  base::string16 GetNaClPortText(int nacl_port) {
+    if (nacl_port == nacl::kGdbDebugStubPortUnused)
+      return n_a_string_;
+
+    if (nacl_port == nacl::kGdbDebugStubPortUnknown)
+      return unknown_string_;
+
+    return base::IntToString16(nacl_port);
+  }
+
+  base::string16 GetWindowsHandlesText(int64 current, int64 peak) {
+    return l10n_util::GetStringFUTF16(IDS_TASK_MANAGER_HANDLES_CELL_TEXT,
+                                      base::Int64ToString16(current),
+                                      base::Int64ToString16(peak));
+  }
+
+  base::string16 GetNetworkUsageText(int64 network_usage) {
+    if (network_usage == -1)
+      return n_a_string_;
+
+    if (network_usage == 0)
+      return zero_string_;
+
+    base::string16 net_byte = ui::FormatSpeed(network_usage);
+    // Force number string to have LTR directionality.
+    return base::i18n::GetDisplayStringInLTRDirectionality(net_byte);
+  }
+
+  base::string16 GetProcessIdText(base::ProcessId proc_id) {
+    return base::IntToString16(proc_id);
+  }
+
+  base::string16 FormatAllocatedAndUsedMemory(int64 allocated, int64 used) {
+    return l10n_util::GetStringFUTF16(
+        IDS_TASK_MANAGER_CACHE_SIZE_CELL_TEXT,
+        ui::FormatBytesWithUnits(allocated, ui::DATA_UNITS_KIBIBYTE, false),
+        ui::FormatBytesWithUnits(used, ui::DATA_UNITS_KIBIBYTE, false));
+  }
+
+  base::string16 GetWebCacheStatText(
+      const blink::WebCache::ResourceTypeStat& stat) {
+    return FormatAllocatedAndUsedMemory(stat.size, stat.liveSize);
+  }
+
+  const base::string16& n_a_string() const { return n_a_string_; }
+  const base::string16& zero_string() const { return zero_string_; }
+  const base::string16& asterisk_string() const { return asterisk_string_; }
+  const base::string16& unknown_string() const { return unknown_string_; }
+
+ private:
+  // The localized string "N/A".
+  const base::string16 n_a_string_;
+
+  // The value 0 as a string "0".
+  const base::string16 zero_string_;
+
+  // The string "*" that is used to show that there exists duplicates in the
+  // GPU memory.
+  const base::string16 asterisk_string_;
+
+  // The string "Unknown".
+  const base::string16 unknown_string_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskManagerValuesStringifier);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// TableSortDescriptor:
+////////////////////////////////////////////////////////////////////////////////
+
+TableSortDescriptor::TableSortDescriptor()
+    : sorted_column_id(-1),
+      is_ascending(false) {
+}
+
+TableSortDescriptor::TableSortDescriptor(int col_id, bool ascending)
+    : sorted_column_id(col_id),
+      is_ascending(ascending) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TaskManagerTableModel:
+////////////////////////////////////////////////////////////////////////////////
+
+TaskManagerTableModel::TaskManagerTableModel(int64_t refresh_flags,
+                                             TableViewDelegate* delegate)
+    : TaskManagerObserver(base::TimeDelta::FromMilliseconds(kRefreshTimeMS),
+                          refresh_flags),
+      table_view_delegate_(delegate),
+      columns_settings_(new base::DictionaryValue),
+      table_model_observer_(nullptr),
+      stringifier_(new TaskManagerValuesStringifier) {
+  DCHECK(delegate);
+}
+
+TaskManagerTableModel::~TaskManagerTableModel() {
+}
+
+int TaskManagerTableModel::RowCount() {
+  return static_cast<int>(tasks_.size());
+}
+
+base::string16 TaskManagerTableModel::GetText(int row, int column) {
+  if (IsSharedByGroup(column) && !IsTaskFirstInGroup(row))
+    return base::string16();
+
+  switch (column) {
+    case IDS_TASK_MANAGER_TASK_COLUMN:
+      return observed_task_manager()->GetTitle(tasks_[row]);
+
+    case IDS_TASK_MANAGER_PROFILE_NAME_COLUMN:
+      return observed_task_manager()->GetProfileName(tasks_[row]);
+
+    case IDS_TASK_MANAGER_NET_COLUMN:
+      return stringifier_->GetNetworkUsageText(
+          observed_task_manager()->GetNetworkUsage(tasks_[row]));
+
+    case IDS_TASK_MANAGER_CPU_COLUMN:
+      return stringifier_->GetCpuUsageText(
+          observed_task_manager()->GetCpuUsage(tasks_[row]));
+
+    case IDS_TASK_MANAGER_PRIVATE_MEM_COLUMN:
+      return stringifier_->GetMemoryUsageText(
+          observed_task_manager()->GetPrivateMemoryUsage(tasks_[row]), false);
+
+    case IDS_TASK_MANAGER_SHARED_MEM_COLUMN:
+      return stringifier_->GetMemoryUsageText(
+          observed_task_manager()->GetSharedMemoryUsage(tasks_[row]), false);
+
+    case IDS_TASK_MANAGER_PHYSICAL_MEM_COLUMN:
+      return stringifier_->GetMemoryUsageText(
+          observed_task_manager()->GetPhysicalMemoryUsage(tasks_[row]), false);
+
+    case IDS_TASK_MANAGER_PROCESS_ID_COLUMN:
+      return stringifier_->GetProcessIdText(
+          observed_task_manager()->GetProcessId(tasks_[row]));
+
+    case IDS_TASK_MANAGER_GDI_HANDLES_COLUMN: {
+      int64 current, peak;
+      observed_task_manager()->GetGDIHandles(tasks_[row], &current, &peak);
+      return stringifier_->GetWindowsHandlesText(current, peak);
+    }
+
+    case IDS_TASK_MANAGER_USER_HANDLES_COLUMN: {
+      int64 current, peak;
+      observed_task_manager()->GetUSERHandles(tasks_[row], &current, &peak);
+      return stringifier_->GetWindowsHandlesText(current, peak);
+    }
+
+    case IDS_TASK_MANAGER_IDLE_WAKEUPS_COLUMN:
+      return stringifier_->GetIdleWakeupsText(
+          observed_task_manager()->GetIdleWakeupsPerSecond(tasks_[row]));
+
+    case IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN: {
+      blink::WebCache::ResourceTypeStats stats;
+      if (observed_task_manager()->GetWebCacheStats(tasks_[row], &stats))
+        return stringifier_->GetWebCacheStatText(stats.images);
+      return stringifier_->n_a_string();
+    }
+
+    case IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN: {
+      blink::WebCache::ResourceTypeStats stats;
+      if (observed_task_manager()->GetWebCacheStats(tasks_[row], &stats))
+        return stringifier_->GetWebCacheStatText(stats.scripts);
+      return stringifier_->n_a_string();
+    }
+
+    case IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN: {
+      blink::WebCache::ResourceTypeStats stats;
+      if (observed_task_manager()->GetWebCacheStats(tasks_[row], &stats))
+        return stringifier_->GetWebCacheStatText(stats.cssStyleSheets);
+      return stringifier_->n_a_string();
+    }
+
+    case IDS_TASK_MANAGER_VIDEO_MEMORY_COLUMN: {
+      bool has_duplicates = false;
+      return stringifier_->GetMemoryUsageText(
+          observed_task_manager()->GetGpuMemoryUsage(tasks_[row],
+                                                     &has_duplicates),
+          has_duplicates);
+    }
+
+    case IDS_TASK_MANAGER_SQLITE_MEMORY_USED_COLUMN:
+      return stringifier_->GetMemoryUsageText(
+          observed_task_manager()->GetSqliteMemoryUsed(tasks_[row]), false);
+
+    case IDS_TASK_MANAGER_JAVASCRIPT_MEMORY_ALLOCATED_COLUMN: {
+      int64 v8_allocated, v8_used;
+      if (observed_task_manager()->GetV8Memory(tasks_[row],
+                                               &v8_allocated,
+                                               &v8_used)) {
+        return stringifier_->FormatAllocatedAndUsedMemory(v8_allocated,
+                                                          v8_used);
+      }
+      return stringifier_->n_a_string();
+    }
+
+    case IDS_TASK_MANAGER_NACL_DEBUG_STUB_PORT_COLUMN:
+      return stringifier_->GetNaClPortText(
+          observed_task_manager()->GetNaClDebugStubPort(tasks_[row]));
+
+    default:
+      NOTREACHED();
+      return base::string16();
+  }
+}
+
+gfx::ImageSkia TaskManagerTableModel::GetIcon(int row) {
+  return observed_task_manager()->GetIcon(tasks_[row]);
+}
+
+void TaskManagerTableModel::SetObserver(
+    ui::TableModelObserver* observer) {
+  table_model_observer_ = observer;
+}
+
+int TaskManagerTableModel::CompareValues(int row1,
+                                         int row2,
+                                         int column_id) {
+  switch (column_id) {
+    case IDS_TASK_MANAGER_TASK_COLUMN:
+    case IDS_TASK_MANAGER_PROFILE_NAME_COLUMN:
+      return ui::TableModel::CompareValues(row1, row2, column_id);
+
+    case IDS_TASK_MANAGER_NET_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetNetworkUsage(tasks_[row1]),
+          observed_task_manager()->GetNetworkUsage(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_CPU_COLUMN:
+      return ValueCompare(observed_task_manager()->GetCpuUsage(tasks_[row1]),
+                          observed_task_manager()->GetCpuUsage(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_PRIVATE_MEM_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetPrivateMemoryUsage(tasks_[row1]),
+          observed_task_manager()->GetPrivateMemoryUsage(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_SHARED_MEM_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetSharedMemoryUsage(tasks_[row1]),
+          observed_task_manager()->GetSharedMemoryUsage(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_PHYSICAL_MEM_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetPhysicalMemoryUsage(tasks_[row1]),
+          observed_task_manager()->GetPhysicalMemoryUsage(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_NACL_DEBUG_STUB_PORT_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetNaClDebugStubPort(tasks_[row1]),
+          observed_task_manager()->GetNaClDebugStubPort(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_PROCESS_ID_COLUMN:
+      return ValueCompare(observed_task_manager()->GetProcessId(tasks_[row1]),
+                          observed_task_manager()->GetProcessId(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_GDI_HANDLES_COLUMN: {
+      int64 current1, peak1, current2, peak2;
+      observed_task_manager()->GetGDIHandles(tasks_[row1], &current1, &peak1);
+      observed_task_manager()->GetGDIHandles(tasks_[row2], &current2, &peak2);
+      return ValueCompare(current1, current2);
+    }
+
+    case IDS_TASK_MANAGER_USER_HANDLES_COLUMN: {
+      int64 current1, peak1, current2, peak2;
+      observed_task_manager()->GetUSERHandles(tasks_[row1], &current1, &peak1);
+      observed_task_manager()->GetUSERHandles(tasks_[row2], &current2, &peak2);
+      return ValueCompare(current1, current2);
+    }
+
+    case IDS_TASK_MANAGER_IDLE_WAKEUPS_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetIdleWakeupsPerSecond(tasks_[row1]),
+          observed_task_manager()->GetIdleWakeupsPerSecond(tasks_[row2]));
+
+    case IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN: {
+      blink::WebCache::ResourceTypeStats stats1;
+      blink::WebCache::ResourceTypeStats stats2;
+      bool row1_stats_valid =
+          observed_task_manager()->GetWebCacheStats(tasks_[row1], &stats1);
+      bool row2_stats_valid =
+          observed_task_manager()->GetWebCacheStats(tasks_[row2], &stats2);
+      if (!row1_stats_valid || !row2_stats_valid)
+        return OrderUnavailableValue(row1_stats_valid, row2_stats_valid);
+
+      switch (column_id) {
+        case IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN:
+          return ValueCompare(stats1.images.size, stats2.images.size);
+        case IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN:
+          return ValueCompare(stats1.scripts.size, stats2.scripts.size);
+        case IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN:
+          return ValueCompare(stats1.cssStyleSheets.size,
+                              stats2.cssStyleSheets.size);
+        default:
+          NOTREACHED();
+          return 0;
+      }
+    }
+
+    case IDS_TASK_MANAGER_VIDEO_MEMORY_COLUMN: {
+      bool has_duplicates;
+      return ValueCompare(
+          observed_task_manager()->GetGpuMemoryUsage(tasks_[row1],
+                                                     &has_duplicates),
+          observed_task_manager()->GetGpuMemoryUsage(tasks_[row2],
+                                                     &has_duplicates));
+    }
+
+    case IDS_TASK_MANAGER_JAVASCRIPT_MEMORY_ALLOCATED_COLUMN: {
+      int64 allocated1, allocated2, used1, used2;
+      observed_task_manager()->GetV8Memory(tasks_[row1], &allocated1, &used1);
+      observed_task_manager()->GetV8Memory(tasks_[row2], &allocated2, &used2);
+      return ValueCompare(allocated1, allocated2);
+    }
+
+    case IDS_TASK_MANAGER_SQLITE_MEMORY_USED_COLUMN:
+      return ValueCompare(
+          observed_task_manager()->GetSqliteMemoryUsed(tasks_[row1]),
+          observed_task_manager()->GetSqliteMemoryUsed(tasks_[row2]));
+
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
+void TaskManagerTableModel::GetRowsGroupRange(int row_index,
+                                              int* out_start,
+                                              int* out_length) {
+  int i = row_index;
+  for ( ; i >= 0; --i) {
+    if (IsTaskFirstInGroup(i))
+      break;
+  }
+
+  CHECK_GE(i, 0);
+
+  *out_start = i;
+  *out_length = observed_task_manager()->GetNumberOfTasksOnSameProcess(
+      tasks_[row_index]);
+}
+
+void TaskManagerTableModel::OnTaskAdded(TaskId id) {
+  // For the table view scrollbar to behave correctly we must inform it that
+  // a new task has been added.
+
+  // We will get a newly sorted list from the task manager as opposed to just
+  // adding |id| to |tasks_| because we want to keep |tasks_| sorted by proc IDs
+  // and then by Task IDs.
+  tasks_ = observed_task_manager()->GetTaskIdsList();
+  if (table_model_observer_)
+    table_model_observer_->OnItemsAdded(RowCount() - 1, 1);
+}
+
+void TaskManagerTableModel::OnTaskToBeRemoved(TaskId id) {
+  auto index = std::find(tasks_.begin(), tasks_.end(), id);
+  if (index == tasks_.end())
+    return;
+  auto removed_index = index - tasks_.begin();
+  tasks_.erase(index);
+  if (table_model_observer_)
+    table_model_observer_->OnItemsRemoved(removed_index, 1);
+}
+
+void TaskManagerTableModel::OnTasksRefreshed(
+    const TaskIdList& task_ids) {
+  tasks_ = task_ids;
+  OnRefresh();
+}
+
+void TaskManagerTableModel::StartUpdating() {
+  TaskManagerInterface::GetTaskManager()->AddObserver(this);
+  tasks_ = observed_task_manager()->GetTaskIdsList();
+  OnRefresh();
+}
+
+void TaskManagerTableModel::StopUpdating() {
+  observed_task_manager()->RemoveObserver(this);
+}
+
+void TaskManagerTableModel::ActivateTask(int row_index) {
+  observed_task_manager()->ActivateTask(tasks_[row_index]);
+}
+
+void TaskManagerTableModel::KillTask(int row_index) {
+  base::ProcessId proc_id = observed_task_manager()->GetProcessId(
+      tasks_[row_index]);
+
+  DCHECK_NE(proc_id, base::GetCurrentProcId());
+
+  base::Process process = base::Process::Open(proc_id);
+  process.Terminate(content::RESULT_CODE_KILLED, false);
+}
+
+void TaskManagerTableModel::UpdateRefreshTypes(int column_id, bool visibility) {
+  bool new_visibility = visibility;
+  RefreshType type = REFRESH_TYPE_NONE;
+  switch (column_id) {
+    case IDS_TASK_MANAGER_PROFILE_NAME_COLUMN:
+    case IDS_TASK_MANAGER_TASK_COLUMN:
+    case IDS_TASK_MANAGER_PROCESS_ID_COLUMN:
+      return;  // The data is these columns do not change.
+
+    case IDS_TASK_MANAGER_NET_COLUMN:
+      type = REFRESH_TYPE_NETWORK_USAGE;
+      break;
+
+    case IDS_TASK_MANAGER_CPU_COLUMN:
+      type = REFRESH_TYPE_CPU;
+      break;
+
+    case IDS_TASK_MANAGER_PHYSICAL_MEM_COLUMN:
+    case IDS_TASK_MANAGER_PRIVATE_MEM_COLUMN:
+    case IDS_TASK_MANAGER_SHARED_MEM_COLUMN:
+      type = REFRESH_TYPE_MEMORY;
+      if (table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_PHYSICAL_MEM_COLUMN) ||
+          table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_PRIVATE_MEM_COLUMN) ||
+          table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_SHARED_MEM_COLUMN)) {
+        new_visibility = true;
+      }
+      break;
+
+    case IDS_TASK_MANAGER_GDI_HANDLES_COLUMN:
+    case IDS_TASK_MANAGER_USER_HANDLES_COLUMN:
+      type = REFRESH_TYPE_HANDLES;
+      if (table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_GDI_HANDLES_COLUMN) ||
+          table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_USER_HANDLES_COLUMN)) {
+        new_visibility = true;
+      }
+      break;
+
+    case IDS_TASK_MANAGER_IDLE_WAKEUPS_COLUMN:
+      type = REFRESH_TYPE_IDLE_WAKEUPS;
+      break;
+
+    case IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN:
+    case IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN:
+      type = REFRESH_TYPE_WEBCACHE_STATS;
+      if (table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_WEBCORE_IMAGE_CACHE_COLUMN) ||
+          table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_WEBCORE_SCRIPTS_CACHE_COLUMN) ||
+          table_view_delegate_->IsColumnVisible(
+              IDS_TASK_MANAGER_WEBCORE_CSS_CACHE_COLUMN)) {
+        new_visibility = true;
+      }
+      break;
+
+    case IDS_TASK_MANAGER_VIDEO_MEMORY_COLUMN:
+      type = REFRESH_TYPE_GPU_MEMORY;
+      break;
+
+    case IDS_TASK_MANAGER_SQLITE_MEMORY_USED_COLUMN:
+      type = REFRESH_TYPE_SQLITE_MEMORY;
+      break;
+
+    case IDS_TASK_MANAGER_JAVASCRIPT_MEMORY_ALLOCATED_COLUMN:
+      type = REFRESH_TYPE_V8_MEMORY;
+      break;
+
+    case IDS_TASK_MANAGER_NACL_DEBUG_STUB_PORT_COLUMN:
+      type = REFRESH_TYPE_NACL;
+      break;
+
+    default:
+      NOTREACHED();
+      return;
+  }
+
+  if (new_visibility)
+    AddRefreshType(type);
+  else
+    RemoveRefreshType(type);
+}
+
+bool TaskManagerTableModel::IsBrowserProcess(int row_index) const {
+  return observed_task_manager()->GetProcessId(tasks_[row_index]) ==
+      base::GetCurrentProcId();
+}
+
+void TaskManagerTableModel::RetrieveSavedColumnsSettingsAndUpdateTable() {
+  if (!g_browser_process->local_state())
+    return;
+
+  const base::DictionaryValue* dictionary =
+      g_browser_process->local_state()->GetDictionary(
+          prefs::kTaskManagerColumnVisibility);
+  if (!dictionary)
+    return;
+
+  // Do a best effort of retrieving the correct settings from the local state.
+  // Use the default settings of the value if it fails to be retrieved.
+  std::string sorted_col_id;
+  bool sort_is_ascending = true;
+  dictionary->GetString(kSortColumnIdKey, &sorted_col_id);
+  dictionary->GetBoolean(kSortIsAscendingKey, &sort_is_ascending);
+
+  int current_visible_column_index = 0;
+  for (size_t i = 0; i < kColumnsSize; ++i) {
+    const int col_id = kColumns[i].id;
+    const std::string col_id_key(GetColumnIdAsString(col_id));
+
+    if (col_id_key.empty())
+      continue;
+
+    bool col_visibility = kColumns[i].default_visibility;
+    dictionary->GetBoolean(col_id_key, &col_visibility);
+
+    // If the above GetBoolean() fails, the |col_visibility| remains at the
+    // default visibility.
+    columns_settings_->SetBoolean(col_id_key, col_visibility);
+    table_view_delegate_->SetColumnVisibility(col_id, col_visibility);
+    UpdateRefreshTypes(col_id, col_visibility);
+
+    if (col_visibility) {
+      if (sorted_col_id == col_id_key) {
+        if (sort_is_ascending == kColumns[i].initial_sort_is_ascending) {
+          table_view_delegate_->ToggleSortOrder(current_visible_column_index);
+        } else {
+          // Unfortunately the API of ui::TableView doesn't provide a clean way
+          // to sort by a particular column ID and a sort direction. If the
+          // retrieved sort direction is different than the initial one, we have
+          // to toggle the sort order twice!
+          // Note that the function takes the visible_column_index rather than
+          // a column ID.
+          table_view_delegate_->ToggleSortOrder(current_visible_column_index);
+          table_view_delegate_->ToggleSortOrder(current_visible_column_index);
+        }
+      }
+
+      ++current_visible_column_index;
+    }
+  }
+}
+
+void TaskManagerTableModel::StoreColumnsSettings() {
+  PrefService* local_state = g_browser_process->local_state();
+  if (!local_state)
+    return;
+
+  DictionaryPrefUpdate dict_update(local_state,
+                                   prefs::kTaskManagerColumnVisibility);
+
+  base::DictionaryValue::Iterator it(*columns_settings_);
+  while (!it.IsAtEnd()) {
+    dict_update->Set(it.key(), it.value().CreateDeepCopy());
+    it.Advance();
+  }
+
+  // Store the current sort status to be restored again at startup.
+  if (!table_view_delegate_->IsTableSorted()) {
+    dict_update->SetString(kSortColumnIdKey, "");
+  } else {
+    const auto& sort_descriptor = table_view_delegate_->GetSortDescriptor();
+    dict_update->SetString(
+        kSortColumnIdKey,
+        GetColumnIdAsString(sort_descriptor.sorted_column_id));
+    dict_update->SetBoolean(kSortIsAscendingKey, sort_descriptor.is_ascending);
+  }
+}
+
+void TaskManagerTableModel::ToggleColumnVisibility(int column_id) {
+  bool new_visibility = !table_view_delegate_->IsColumnVisible(column_id);
+  table_view_delegate_->SetColumnVisibility(column_id, new_visibility);
+  columns_settings_->SetBoolean(GetColumnIdAsString(column_id), new_visibility);
+  UpdateRefreshTypes(column_id, new_visibility);
+}
+
+void TaskManagerTableModel::OnRefresh() {
+  if (table_model_observer_)
+    table_model_observer_->OnItemsChanged(0, RowCount());
+}
+
+bool TaskManagerTableModel::IsTaskFirstInGroup(int row_index) const {
+  if (row_index == 0)
+    return true;
+
+  return observed_task_manager()->GetProcessId(tasks_[row_index - 1]) !=
+      observed_task_manager()->GetProcessId(tasks_[row_index]);
+}
+
+
+}  // namespace task_management