Fix nested GuestView's container bounds calculation.

chrome/browser/pdf/pdf_extension_util.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PDF_PDF_EXTENSION_UTIL_H_
 #define CHROME_BROWSER_PDF_PDF_EXTENSION_UTIL_H_
 
 #include <string>
 
+namespace content {
+class WebContents;
+}  // namespace content
+
 namespace pdf_extension_util {
 
 // The ResourceIdentifier for the PDF Viewer plugin.
 extern const char kPdfResourceIdentifier[];
 
 // Return the extensions manifest for PDF. The manifest is loaded from
 // browser_resources.grd and certain fields are replaced based on what chrome
 // flags are enabled.
 std::string GetManifest();
 
+// Ensures through PDFScriptingAPI that a PDF has finished loading inside the
+// given |web_contents|.
+// Returns true if it loads successfully or false if it fails. If it doesn't
+// finish loading the test will hang. This is done from outside of the
+// BrowserPluginGuest to ensure the PDFScriptingAPI works correctly from there.
+bool EnsurePDFHasLoaded(content::WebContents* web_contents);
+
 }  // namespace pdf_extension_util
 
 #endif  // CHROME_BROWSER_PDF_PDF_EXTENSION_UTIL_H_