DriveFileSyncService listens to OnNetworkConnected event to restart synchronization

chrome/browser/sync_file_system/drive_file_sync_client.h

Index: chrome/browser/sync_file_system/drive_file_sync_client.h
diff --git a/chrome/browser/sync_file_system/drive_file_sync_client.h b/chrome/browser/sync_file_system/drive_file_sync_client.h
index 80b5619fe22eb49426d63658f7934fce7f749e70..c59c25b0be868bfe3312d3f3d7584597f41c7156 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_client.h
+++ b/chrome/browser/sync_file_system/drive_file_sync_client.h
@@ -16,6 +16,7 @@
 #include "chrome/browser/google_apis/drive_upload_error.h"
 #include "chrome/browser/google_apis/gdata_errorcode.h"
 #include "chrome/browser/google_apis/gdata_wapi_parser.h"
+#include "net/base/network_change_notifier.h"
 
 class GURL;
 class Profile;
@@ -31,6 +32,7 @@ class DriveFileSyncClientObserver {
   DriveFileSyncClientObserver() {}
   virtual ~DriveFileSyncClientObserver() {}
   virtual void OnAuthenticated() = 0;
+  virtual void OnNetworkConnected() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DriveFileSyncClientObserver);
@@ -39,9 +41,11 @@ class DriveFileSyncClientObserver {
 // This class is responsible for talking to the Drive service to get and put
 // Drive directories, files and metadata.
 // This class is owned by DriveFileSyncService.
-class DriveFileSyncClient : public google_apis::DriveServiceObserver,
-                            public base::NonThreadSafe,
-                            public base::SupportsWeakPtr<DriveFileSyncClient> {
+class DriveFileSyncClient
+    : public google_apis::DriveServiceObserver,
+      public net::NetworkChangeNotifier::ConnectionTypeObserver,
+      public base::NonThreadSafe,
+      public base::SupportsWeakPtr<DriveFileSyncClient> {
  public:
   typedef base::Callback<void(google_apis::GDataErrorCode error)>
       GDataErrorCallback;
@@ -168,6 +172,10 @@ class DriveFileSyncClient : public google_apis::DriveServiceObserver,
   // DriveServiceObserver overrides.
   virtual void OnReadyToPerformOperations() OVERRIDE;
 
+  // ConnectionTypeObserver overrides.
+  virtual void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
+
  private:
   friend class DriveFileSyncClientTest;
   friend class DriveFileSyncServiceTest;