added 'reuseUI' capability

Author: nataliakoval

inc/webdriver_capabilities_parser.h

@@ -7,6 +7,10 @@ There are two capabilities which define strategy what view will be current after
 - "windowsize" - HWD will be try create window with given size, as a string (e.g. - "600, 600")
 - "windowposition" - HWD will be try start window with desired position, as a string (e.g. - "80, 60")
 - "maximize" - HWD will be try start window with maximum size
+- "reuseUI" - HWD checks it of prev session, if those caps not specified,
+in case of attempt to create second session we get exeception of "one session only",<br/>
+otherwise first session will be terminated without closing windows and new session can reuse that windows
+
 
 For browserClass customizer can define some generic classes. In example in default 
 QT extension there is handling of "WidgetView" and "WebView" values for this capability.
@@ -71,6 +75,8 @@ struct Capabilities {
     /// start window with maximum size
     static const char kMaximize[];
 
+    static const char kReuseUI[];
+
     Capabilities();
     ~Capabilities();
 

src/webdriver/commands/create_session.cc

@@ -44,9 +44,18 @@ void CreateSession::ExecutePost(Response* const response) {
     // get optional required capabilities
     (void)GetDictionaryParameter("requiredCapabilities", &required_caps_dict);
 
-    if (SessionManager::GetInstance()->GetSessions().size() > 0) {
-        response->SetError(new Error(kUnknownError, "Cannot start session. WD support only one session at the moment"));
-        return;
+    std::map<std::string, Session*> sessionMap = SessionManager::GetInstance()->GetSessions();
+    if (sessionMap.size() > 0) {
+        // session map can consist only single session at the moment
+        Session* prev_session = sessionMap.begin()->second;
+        bool reuse_ua;
+        prev_session->capabilities().caps->GetBoolean(Capabilities::kReuseUI, &reuse_ua);
+        if (reuse_ua) {
+            prev_session->Terminate();
+        } else {
+            response->SetError(new Error(kUnknownError, "Cannot start session. WD support only one session at the moment"));
+            return;
+        }
     }
 
     // Session manages its own liftime, so do not call delete.

src/webdriver/webdriver_capabilities_parser.cc

@@ -45,6 +45,7 @@ const char Capabilities::kWindowSize[]                  = "windowsize";
 const char Capabilities::kWindowPosition[]              = "windowposition";
 const char Capabilities::kMaximize[]                    = "maximize";
 const char Capabilities::kHybrid[]                      = "hybrid";
+const char Capabilities::kReuseUI[]                     = "reuseUI";
 
 namespace {
 

src/webdriver/webdriver_session.cc

@@ -98,6 +98,17 @@ bool Session::InitActualCapabilities() {
         hybrid->SetBoolean(*iter, true);
     }
     capabilities_.caps->Set(Capabilities::kHybrid, hybrid);
+
+    bool reuse_ui;
+    if (required_caps_.get()) {
+        required_caps_->GetBoolean(Capabilities::kReuseUI, &reuse_ui);
+    } else if (desired_caps_.get()) {
+        desired_caps_->GetBoolean(Capabilities::kReuseUI, &reuse_ui);
+    } else {
+        reuse_ui = false;
+    }
+    capabilities_.caps->SetBoolean(Capabilities::kReuseUI, reuse_ui);
+
     return true;
 }