Add support for setting http referrer

- Add url option to specify the http referrer
- Add httpReferrer attribute to webview

NOTE: This is still not complete. Some love has to be done to
guest-view-manager.coffee and very likely the function calls called
createGuest and to the code that uses them.

atom/browser/api/atom_api_web_contents.cc

@@ -286,8 +286,14 @@ bool WebContents::IsAlive() const {
   return web_contents() != NULL;
 }
 
-void WebContents::LoadURL(const GURL& url) {
+void WebContents::LoadURL(const GURL& url, const mate::Dictionary& options) {
   content::NavigationController::LoadURLParams params(url);
+
+  base::string16 http_referrer_;
+
+  if(options.Get("httpReferrer", &http_referrer_))
+    params.referrer = content::Referrer(GURL(http_referrer_).GetAsReferrer(), blink::WebReferrerPolicyDefault);
+
   params.transition_type = content::PAGE_TRANSITION_TYPED;
   params.override_user_agent = content::NavigationController::UA_OVERRIDE_TRUE;
   web_contents()->GetController().LoadURLWithParams(params);
@@ -313,15 +319,15 @@ void WebContents::Stop() {
   web_contents()->Stop();
 }
 
-void WebContents::Reload() {
+void WebContents::Reload(const mate::Dictionary& options) {
   // Navigating to a URL would always restart the renderer process, we want this
   // because normal reloading will break our node integration.
   // This is done by AtomBrowserClient::ShouldSwapProcessesForNavigation.
-  LoadURL(GetURL());
+  LoadURL(GetURL(), options);
 }
 
-void WebContents::ReloadIgnoringCache() {
-  Reload();
+void WebContents::ReloadIgnoringCache(const mate::Dictionary& options) {
+  Reload(options);
 }
 
 bool WebContents::CanGoBack() const {

atom/browser/api/atom_api_web_contents.h

@@ -41,14 +41,14 @@ class WebContents : public mate::EventEmitter,
 
   void Destroy();
   bool IsAlive() const;
-  void LoadURL(const GURL& url);
+  void LoadURL(const GURL& url, const mate::Dictionary& options);
   GURL GetURL() const;
   base::string16 GetTitle() const;
   bool IsLoading() const;
   bool IsWaitingForResponse() const;
   void Stop();
-  void Reload();
-  void ReloadIgnoringCache();
+  void Reload(const mate::Dictionary& options);
+  void ReloadIgnoringCache(const mate::Dictionary& options);
   bool CanGoBack() const;
   bool CanGoForward() const;
   bool CanGoToOffset(int offset) const;

atom/browser/api/lib/browser-window.coffee

@@ -11,6 +11,8 @@ BrowserWindow::__proto__ = EventEmitter.prototype
 BrowserWindow.windows = new IDWeakMap
 
 BrowserWindow::_init = ->
+  @urlOptions = {}
+
   # Simulate the application menu on platforms other than OS X.
   if process.platform isnt 'darwin'
     menu = app.getApplicationMenu()
@@ -84,14 +86,23 @@ BrowserWindow.fromId = (id) ->
   BrowserWindow.windows.get id
 
 # Helpers.
-BrowserWindow::loadUrl = -> @webContents.loadUrl.apply @webContents, arguments
+BrowserWindow::loadUrl = ->
+  args = [].slice.call arguments
+  unless args.length > 1
+    args.push @urlOptions
+
+  #TODO: This needs fixing!
+  @urlOptions = args[1]
+
+  @webContents.loadUrl.apply @webContents, args
+
 BrowserWindow::send = -> @webContents.send.apply @webContents, arguments
 
 # Be compatible with old API.
 BrowserWindow::restart = -> @webContents.reload()
 BrowserWindow::getUrl = -> @webContents.getUrl()
-BrowserWindow::reload = -> @webContents.reload()
-BrowserWindow::reloadIgnoringCache = -> @webContents.reloadIgnoringCache()
+BrowserWindow::reload = -> @webContents.reload(@urlOptions)
+BrowserWindow::reloadIgnoringCache = -> @webContents.reloadIgnoringCache(@urlOptions)
 BrowserWindow::getPageTitle = -> @webContents.getTitle()
 BrowserWindow::isLoading = -> @webContents.isLoading()
 BrowserWindow::isWaitingForResponse = -> @webContents.isWaitingForResponse()