Stub out Document::syncAnnotScan method.chromium/2834

The PDF specification [1] says:

"
syncAnnotScan guarantees that all annotations will be scanned
by the time this method returns.
(..)
Normally a background task runs that examine every page and
looks for annotations during idle times.
"

The statement details specifically how Acrobat implements
this method.
Although, neither the method itself nor the background scanner
task are implemented in PDFium (as of today, Ago/2016),
not having ::syncAnnotScan at least stubbed out can be considered
harmfull since its absence makes JS acrobat scripts silently
fail when it has a call to it.

Given that, and following a stub-out pattern present in other
methods including ::addAnnot and ::addField, CL provides
a stubbed out implementation of Document::syncAnnotScan.

[1] http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/js_api_reference.pdf

BUG=pdfium:492

Review-Url: https://codereview.chromium.org/2265553002

1 files changed, 5 insertions, 0 deletions

diff --git a/fpdfsdk/javascript/Document.h b/fpdfsdk/javascript/Document.h
index 1c20ac4221..feef228c6e 100644
--- a/fpdfsdk/javascript/Document.h
+++ b/fpdfsdk/javascript/Document.h
@@ -255,6 +255,10 @@ class Document : public CJS_EmbedObj {
                      const std::vector<CJS_Value>& params,
                      CJS_Value& vRet,
                      CFX_WideString& sError);
+  FX_BOOL syncAnnotScan(IJS_Context* cc,
+                        const std::vector<CJS_Value>& params,
+                        CJS_Value& vRet,
+                        CFX_WideString& sError);
   FX_BOOL mailDoc(IJS_Context* cc,
                   const std::vector<CJS_Value>& params,
                   CJS_Value& vRet,
@@ -371,6 +375,7 @@ class CJS_Document : public CJS_Object {
   JS_STATIC_METHOD(resetForm, Document);
   JS_STATIC_METHOD(saveAs, Document);
   JS_STATIC_METHOD(submitForm, Document);
+  JS_STATIC_METHOD(syncAnnotScan, Document);
   JS_STATIC_METHOD(mailDoc, Document);
 };