Fix nested GuestView's container bounds calculation.

chrome/browser/pdf/pdf_extension_util.h

Index: chrome/browser/pdf/pdf_extension_util.h
diff --git a/chrome/browser/pdf/pdf_extension_util.h b/chrome/browser/pdf/pdf_extension_util.h
index 75dd882b0081fa8ffc64884ff257889879a6eae2..ce0ab58c40e168e38529a30f3a103c78db9d0c12 100644
--- a/chrome/browser/pdf/pdf_extension_util.h
+++ b/chrome/browser/pdf/pdf_extension_util.h
@@ -7,6 +7,10 @@
 
 #include <string>
 
+namespace content {
+class WebContents;
+}  // namespace content
+
 namespace pdf_extension_util {
 
 // The ResourceIdentifier for the PDF Viewer plugin.
@@ -17,6 +21,13 @@ extern const char kPdfResourceIdentifier[];
 // 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_