Add functionality for copying text within form text fields and form combobox text fields

pdf/pdfium/pdfium_page.h

 // Copyright (c) 2010 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 PDF_PDFIUM_PDFIUM_PAGE_H_
 #define PDF_PDFIUM_PDFIUM_PAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 33 matching lines @@
                       uint32_t* out_len,
                       double* out_font_size,
                       pp::FloatRect* out_bounds);
   // Get a unicode character from the page.
   uint32_t GetCharUnicode(int char_index);
   // Get the bounds of a character in page pixels.
   pp::FloatRect GetCharBounds(int char_index);
 
   enum Area {
     NONSELECTABLE_AREA,
-    TEXT_AREA,
-    WEBLINK_AREA,  // Area is a hyperlink.
-    DOCLINK_AREA,  // Area is a link to a different part of the same document.
+    TEXT_AREA,       // Area contains regular, selectable text not
+                     // within form fields.
+    WEBLINK_AREA,    // Area is a hyperlink.
+    DOCLINK_AREA,    // Area is a link to a different part of the same
+                     // document.
+    FORM_TEXT_AREA,  // Area is a form text field or form combobox text
+                     // field.
   };
 
   struct LinkTarget {
     // We are using std::string here which have a copy contructor.
     // That prevents us from using union here.
     std::string url;  // Valid for WEBLINK_AREA only.
     int page;         // Valid for DOCLINK_AREA only.
   };
 
   // Given a point in the document that's in this page, returns its character
@@ skipping 72 matching lines @@
   int loading_count_;
   pp::Rect rect_;
   bool calculated_links_;
   std::vector<Link> links_;
   bool available_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDFIUM_PDFIUM_PAGE_H_