[GCM] Extracting GCMConnectionObserver from GCMAppHandler

components/gcm_driver/gcm_driver.cc

Index: components/gcm_driver/gcm_driver.cc
diff --git a/components/gcm_driver/gcm_driver.cc b/components/gcm_driver/gcm_driver.cc
index e9ff81975aac5f9d4b4bd064bcf67c4216761314..4d3e601cfa8556db097bf60ffc23c45d104b9f7c 100644
--- a/components/gcm_driver/gcm_driver.cc
+++ b/components/gcm_driver/gcm_driver.cc
@@ -185,6 +185,12 @@ GCMAppHandler* GCMDriver::GetAppHandler(const std::string& app_id) {
   return &default_app_handler_;
 }
 
+void GCMDriver::AddConnectionObserver(GCMConnectionObserver* observer) {
+}

[jianli, 2014/08/27 23:34:17]

Please comment that connection observing is only supported in desktop version.

[fgorski, 2014/08/27 23:51:45]

Done. Made abstract in GCMDriver and moved empty methods to GCMDriverAndroid

+
+void GCMDriver::RemoveConnectionObserver(GCMConnectionObserver* observer) {
+}
+
 bool GCMDriver::HasRegisterCallback(const std::string& app_id) {
   return register_callbacks_.find(app_id) != register_callbacks_.end();
 }