Merge pull request #6355 from electron/webview-capture-page

Add <webview>.capturePage([rect,] callback)

lib/browser/api/browser-window.js

@@ -153,6 +153,9 @@ Object.assign(BrowserWindow.prototype, {
   },
   showDefinitionForSelection () {
     return this.webContents.showDefinitionForSelection()
+  },
+  capturePage (...args) {
+    return this.webContents.capturePage.apply(this.webContents, args)
   }
 })
 

lib/renderer/web-view/web-view.js

@@ -386,7 +386,8 @@ var registerWebViewElement = function () {
     'inspectServiceWorker',
     'print',
     'printToPDF',
-    'showDefinitionForSelection'
+    'showDefinitionForSelection',
+    'capturePage'
   ]
   nonblockMethods = [
     'insertCSS',