Add tests for CBA_AnnotIterator.

fpdfsdk/src/fsdk_mgr.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <algorithm>
 #include <memory>
 
 #include "fpdfsdk/include/fsdk_mgr.h"
@@ skipping 360 matching lines @@
     m_pActionHandler.reset(new CPDFSDK_ActionHandler());
   return m_pActionHandler.get();
 }
 
 CFFL_IFormFiller* CPDFDoc_Environment::GetIFormFiller() {
   if (!m_pIFormFiller)
     m_pIFormFiller.reset(new CFFL_IFormFiller(this));
   return m_pIFormFiller.get();
 }
 
+// static
+CPDFSDK_Document* CPDFSDK_Document::FromFPDFFormHandle(
+    FPDF_FORMHANDLE hHandle) {
+  CPDFDoc_Environment* pEnv = static_cast<CPDFDoc_Environment*>(hHandle);
+  return pEnv ? pEnv->GetSDKDocument() : nullptr;
+}
+
 CPDFSDK_Document::CPDFSDK_Document(UnderlyingDocumentType* pDoc,
                                    CPDFDoc_Environment* pEnv)
     : m_pDoc(pDoc),
       m_pFocusAnnot(nullptr),
       m_pEnv(pEnv),
       m_bChangeMask(FALSE),
       m_bBeingDestroyed(FALSE) {}
 
 CPDFSDK_Document::~CPDFSDK_Document() {
   m_bBeingDestroyed = TRUE;
@@ skipping 526 matching lines @@
   CPDFSDK_Annot* pFocusAnnot = m_pSDKDoc->GetFocusAnnot();
   if (!pFocusAnnot)
     return nullptr;
 
   for (CPDFSDK_Annot* pAnnot : m_fxAnnotArray) {
     if (pAnnot == pFocusAnnot)
       return pAnnot;
   }
   return nullptr;
 }