Add a flag to app_shell that allows roaming on cellular networks

BUG=chrome-os-partner:37102

Review URL: https://codereview.chromium.org/1085973002

Cr-Commit-Position: refs/heads/master@{#325525}

extensions/shell/browser/shell_browser_main_parts.cc

@@ -113,6 +113,12 @@ void ShellBrowserMainParts::PostMainMessageLoopStart() {
   network_controller_.reset(new ShellNetworkController(
       base::CommandLine::ForCurrentProcess()->GetSwitchValueNative(
           switches::kAppShellPreferredNetwork)));
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kAppShellAllowRoaming)) {
+    network_controller_->SetCellularAllowRoaming(true);
+  }
+
 #else
   // Non-Chrome OS platforms are for developer convenience, so use a test IME.
   ui::InitializeInputMethodForTesting();

extensions/shell/browser/shell_network_controller_chromeos.cc

@@ -10,6 +10,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "chromeos/network/network_connection_handler.h"
+#include "chromeos/network/network_device_handler.h"
 #include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_handler_callbacks.h"
 #include "chromeos/network/network_state.h"
@@ -102,6 +103,12 @@ void ShellNetworkController::NetworkConnectionStateChanged(
   }
 }
 
+void ShellNetworkController::SetCellularAllowRoaming(bool allow_roaming) {
+  chromeos::NetworkDeviceHandler* device_handler =
+      chromeos::NetworkHandler::Get()->network_device_handler();
+  device_handler->SetCellularAllowRoaming(allow_roaming);
+}
+
 const chromeos::NetworkState* ShellNetworkController::GetActiveWiFiNetwork() {
   chromeos::NetworkStateHandler* state_handler =
       chromeos::NetworkHandler::Get()->network_state_handler();

extensions/shell/browser/shell_network_controller_chromeos.h

@@ -30,6 +30,9 @@ class ShellNetworkController : public chromeos::NetworkStateHandlerObserver {
   void NetworkConnectionStateChanged(
       const chromeos::NetworkState* state) override;
 
+  // Control whether the cellular network connection allows roaming.
+  void SetCellularAllowRoaming(bool allow_roaming);
+
  private:
   // State of communication with the connection manager.
   enum State {

extensions/shell/common/switches.cc

@@ -7,6 +7,9 @@
 namespace extensions {
 namespace switches {
 
+// Allow roaming in the cellular network.
+const char kAppShellAllowRoaming[] = "app-shell-allow-roaming";
+
 // Size for the host window to create (i.e. "800x600").
 const char kAppShellHostWindowSize[] = "app-shell-host-window-size";
 

extensions/shell/common/switches.h

@@ -10,6 +10,7 @@ namespace switches {
 
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
+extern const char kAppShellAllowRoaming[];
 extern const char kAppShellHostWindowSize[];
 extern const char kAppShellInstallCrx[];
 extern const char kAppShellPreferredNetwork[];