Add fpdf_edit basic creation embedder test.

testing/embedder_test.h

 // Copyright 2015 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.
 
 #ifndef TESTING_EMBEDDER_TEST_H_
 #define TESTING_EMBEDDER_TEST_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 60 matching lines @@
   }
 #endif  // PDF_ENABLE_V8
 
   void SetDelegate(Delegate* delegate) {
     delegate_ = delegate ? delegate : default_delegate_.get();
   }
 
   FPDF_DOCUMENT document() { return document_; }
   FPDF_FORMHANDLE form_handle() { return form_handle_; }
 
+  // Create an empty document, and its form fill environment. Returns true
+  // on success or false on failure.
+  virtual bool CreateEmptyDocument();
+
   // Open the document specified by |filename|, and create its form fill
   // environment, or return false on failure.
   // The filename is relative to the test data directory where we store all the
   // test files.
   virtual bool OpenDocument(const std::string& filename,
                             bool must_linearize = false);
 
   // Perform JavaScript actions that are to run at document open time.
   virtual void DoOpenActions();
 
   // Determine the page numbers present in the document.
   virtual int GetFirstPageNum();
   virtual int GetPageCount();
 
   // Load a specific page of the open document.
   virtual FPDF_PAGE LoadPage(int page_number);
 
   // Load a specific page of the open document using delegate_->GetPage.
   // delegate_->GetPage also caches loaded page.
   virtual FPDF_PAGE LoadAndCachePage(int page_number);
 
   // Convert a loaded page into a bitmap.
   virtual FPDF_BITMAP RenderPage(FPDF_PAGE page);
 
   // Relese the resources obtained from LoadPage(). Further use of |page|
   // is prohibited after this call is made.
   virtual void UnloadPage(FPDF_PAGE page);
 
  protected:
+  void SetupFormFillEnvironment();
+
   Delegate* delegate_;
   std::unique_ptr<Delegate> default_delegate_;
   FPDF_DOCUMENT document_;
   FPDF_FORMHANDLE form_handle_;
   FPDF_AVAIL avail_;
   FX_DOWNLOADHINTS hints_;
   FPDF_FILEACCESS file_access_;
   FX_FILEAVAIL file_avail_;
 #ifdef PDF_ENABLE_V8
   v8::Platform* platform_;
@@ skipping 15 matching lines @@
   static int SetTimerTrampoline(FPDF_FORMFILLINFO* info,
                                 int msecs,
                                 TimerCallback fn);
   static void KillTimerTrampoline(FPDF_FORMFILLINFO* info, int id);
   static FPDF_PAGE GetPageTrampoline(FPDF_FORMFILLINFO* info,
                                      FPDF_DOCUMENT document,
                                      int page_index);
 };
 
 #endif  // TESTING_EMBEDDER_TEST_H_