Merged Tether and cellular network types in System Tray.

ash/system/network/network_list.cc

Index: ash/system/network/network_list.cc
diff --git a/ash/system/network/network_list.cc b/ash/system/network/network_list.cc
index b462bbdfad167379057cdc55cb69b81658cda050..d0135de806c18d8f85861298af6ab6a49f5d8141 100644
--- a/ash/system/network/network_list.cc
+++ b/ash/system/network/network_list.cc
@@ -191,31 +191,22 @@ class CellularHeaderRowView : public NetworkListView::SectionHeaderRowView {
   void OnToggleToggled(bool is_on) override {
     NetworkStateHandler* handler =
         NetworkHandler::Get()->network_state_handler();
-    handler->SetTechnologyEnabled(NetworkTypePattern::Cellular(), is_on,
-                                  chromeos::network_handler::ErrorCallback());
+    // When cellular network technology is available on a device, Tethering is

[Ryan Hansberry, 2017/05/27 00:16:22]

nit: Tether, not Tethering

[lesliewatkins, 2017/05/30 18:29:51]

Done.

+    // treated as a subset of Cellular technology. Otherwise, Tethering has to

[Ryan Hansberry, 2017/05/27 00:16:22]

same nit here

[lesliewatkins, 2017/05/30 18:29:51]

Done.

+    // be explicity enabled and disabled.
+    if (handler->IsTechnologyAvailable(NetworkTypePattern::Cellular())) {
+      handler->SetTechnologyEnabled(NetworkTypePattern::Cellular(), is_on,
+                                    chromeos::network_handler::ErrorCallback());
+    } else {
+      handler->SetTechnologyEnabled(NetworkTypePattern::Tether(), is_on,
+                                    chromeos::network_handler::ErrorCallback());
+    }
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CellularHeaderRowView);
 };
 
-class TetherHeaderRowView : public NetworkListView::SectionHeaderRowView {
- public:
-  TetherHeaderRowView()
-      : SectionHeaderRowView(IDS_ASH_STATUS_TRAY_NETWORK_TETHER) {}
-
-  ~TetherHeaderRowView() override {}
-
-  const char* GetClassName() const override { return "TetherHeaderRowView"; }
-
- protected:
-  void OnToggleToggled(bool is_on) override {
-    // TODO (hansberry): Persist toggle to settings/preferences.
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TetherHeaderRowView);
-};
 
 class WifiHeaderRowView : public NetworkListView::SectionHeaderRowView {
  public:
@@ -298,10 +289,8 @@ NetworkListView::NetworkListView(SystemTrayItem* owner, LoginStatus login)
       no_wifi_networks_view_(nullptr),
       no_cellular_networks_view_(nullptr),
       cellular_header_view_(nullptr),
-      tether_header_view_(nullptr),
       wifi_header_view_(nullptr),
       cellular_separator_view_(nullptr),
-      tether_separator_view_(nullptr),
       wifi_separator_view_(nullptr),
       connection_warning_(nullptr) {}
 
@@ -429,12 +418,12 @@ void NetworkListView::UpdateNetworkIcons() {
         prohibited_by_policy;
     info->connected = network->IsConnectedState();
     info->connecting = network->IsConnectingState();
-    if (network->Matches(NetworkTypePattern::WiFi()))
+    if (network->Matches(NetworkTypePattern::WiFi())) {
       info->type = NetworkInfo::Type::WIFI;
-    else if (network->Matches(NetworkTypePattern::Cellular()))
+    } else if (network->Matches(NetworkTypePattern::Cellular()) ||
+               network->Matches(NetworkTypePattern::Tether())) {
       info->type = NetworkInfo::Type::CELLULAR;
-    else if (network->Matches(NetworkTypePattern::Tether()))
-      info->type = NetworkInfo::Type::TETHER;
+    }
     if (prohibited_by_policy) {
       info->tooltip =
           l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_NETWORK_PROHIBITED);
@@ -515,11 +504,15 @@ NetworkListView::UpdateNetworkListEntries() {
       UpdateNetworkChildren(NetworkInfo::Type::UNKNOWN, index);
   index += new_guids->size();
 
-  if (handler->IsTechnologyAvailable(NetworkTypePattern::Cellular())) {
-    index = UpdateSectionHeaderRow(
-        NetworkTypePattern::Cellular(),
-        handler->IsTechnologyEnabled(NetworkTypePattern::Cellular()), index,
-        &cellular_header_view_, &cellular_separator_view_);
+  if (handler->IsTechnologyAvailable(NetworkTypePattern::Cellular()) ||
+      handler->IsTechnologyAvailable(NetworkTypePattern::Tether())) {
+    bool is_enabled =
+        handler->IsTechnologyEnabled(NetworkTypePattern::Cellular()) ||

[Ryan Hansberry, 2017/05/27 00:16:22]

This is unfortunately now incorrect (it was previously correct :( ).

Based on my previous comment, is_enabled needs to be equal to 

handler->IsTechnologyEnabled(NetworkTypePattern::Cellular()) ||         	       
     (!handler->IsTechnologyAvailable(NetworkTypePattern::Cellular()) &&
handler->IsTechnologyEnabled(NetworkTypePattern::Tether()))

My other previous comment about breaking this up was intended as something like
(sorry that it was confusing):

bool is_enabled = false;
if (handler->IsTechnologyEnabled(NetworkTypePattern::Cellular())
  is_enabled = true;
else
  is_enabled = handler->IsTechnologyEnabled(NetworkTypePattern::Tether();

[lesliewatkins, 2017/05/30 18:29:51]

I think it is correct, actually. Your if-statement is logically identical to the
way the code is currently written. 

+        handler->IsTechnologyEnabled(NetworkTypePattern::Tether());
+
+    index = UpdateSectionHeaderRow(NetworkTypePattern::Cellular(), is_enabled,
+                                   index, &cellular_header_view_,
+                                   &cellular_separator_view_);
   }
 
   // Cellular initializing.
@@ -533,31 +526,14 @@ NetworkListView::UpdateNetworkListEntries() {
   if (cellular_message_id)
     ++index;
 
-  // Add cellular networks.
+  // Add cellular and Tether networks.
+  // TODO (hansberry): Audit existing usage of NonVirtual and consider changing
+  // it to include Tether. See crbug.com/693647.
   std::unique_ptr<std::set<std::string>> new_cellular_guids =
       UpdateNetworkChildren(NetworkInfo::Type::CELLULAR, index);
   index += new_cellular_guids->size();
   new_guids->insert(new_cellular_guids->begin(), new_cellular_guids->end());
 
-  // TODO (hansberry): Audit existing usage of NonVirtual and consider changing
-  // it to include Tether. See crbug.com/693647.
-  if (handler->IsTechnologyAvailable(NetworkTypePattern::Tether())) {
-    index = UpdateSectionHeaderRow(
-        NetworkTypePattern::Tether(),
-        handler->IsTechnologyEnabled(NetworkTypePattern::Tether()), index,
-        &tether_header_view_, &tether_separator_view_);
-
-    // TODO (hansberry): Should a message similar to
-    // IDS_ASH_STATUS_TRAY_NO_CELLULAR_NETWORKS be shown if Tether technology is
-    // enabled but no networks are around?
-
-    // Add Tether networks.
-    std::unique_ptr<std::set<std::string>> new_tether_guids =
-        UpdateNetworkChildren(NetworkInfo::Type::TETHER, index);
-    index += new_tether_guids->size();
-    new_guids->insert(new_tether_guids->begin(), new_tether_guids->end());
-  }
-
   index = UpdateSectionHeaderRow(
       NetworkTypePattern::WiFi(),
       handler->IsTechnologyEnabled(NetworkTypePattern::WiFi()), index,
@@ -701,10 +677,9 @@ int NetworkListView::UpdateSectionHeaderRow(NetworkTypePattern pattern,
                                             SectionHeaderRowView** view,
                                             views::Separator** separator_view) {
   if (!*view) {
-    if (pattern.Equals(NetworkTypePattern::Cellular()))
+    if (pattern.Equals(NetworkTypePattern::Cellular()) ||
+        pattern.Equals(NetworkTypePattern::Tether()))
       *view = new CellularHeaderRowView();
-    else if (pattern.Equals(NetworkTypePattern::Tether()))
-      *view = new TetherHeaderRowView();
     else if (pattern.Equals(NetworkTypePattern::WiFi()))
       *view = new WifiHeaderRowView();
     else