Splitting fpdfdoc/doc_* part I

pdfium.gyp

Index: pdfium.gyp
diff --git a/pdfium.gyp b/pdfium.gyp
index fe2d176318e99e3c9883da13ffdbe31b7ed3fe06..d0d23b97d7a308f14be828b4567e6ad0f47b70a3 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -184,11 +184,21 @@
       'sources': [
         'core/fpdfdoc/clines.cpp',
         'core/fpdfdoc/clines.h',
+        'core/fpdfdoc/cpdf_aaction.cpp',
+        'core/fpdfdoc/cpdf_action.cpp',
+        'core/fpdfdoc/cpdf_actionfields.cpp',
         'core/fpdfdoc/cpdf_apsettings.h',
         'core/fpdfdoc/cpdf_annot.cpp',
         'core/fpdfdoc/cpdf_annotlist.cpp',
+        'core/fpdfdoc/cpdf_bookmark.cpp',
+        'core/fpdfdoc/cpdf_bookmarktree.cpp',
+        'core/fpdfdoc/cpdf_docjsactions.cpp',
+        'core/fpdfdoc/cpdf_link.cpp',
+        'core/fpdfdoc/cpdf_linklist.cpp',
+        'core/fpdfdoc/cpdf_metadata.cpp',
         'core/fpdfdoc/cpdf_pagelabel.h',
         'core/fpdfdoc/cpdf_variabletext.cpp',
+        'core/fpdfdoc/cpdf_viewerpreferences.cpp',
         'core/fpdfdoc/cpvt_color.cpp',
         'core/fpdfdoc/cpvt_color.h',
         'core/fpdfdoc/cpvt_dash.h',
@@ -206,18 +216,13 @@
         'core/fpdfdoc/csection.h',
         'core/fpdfdoc/ctypeset.cpp',
         'core/fpdfdoc/ctypeset.h',
-        'core/fpdfdoc/doc_action.cpp',
         'core/fpdfdoc/doc_basic.cpp',
-        'core/fpdfdoc/doc_bookmark.cpp',
         'core/fpdfdoc/doc_form.cpp',
         'core/fpdfdoc/doc_formcontrol.cpp',
         'core/fpdfdoc/doc_formfield.cpp',
-        'core/fpdfdoc/doc_link.cpp',
-        'core/fpdfdoc/doc_metadata.cpp',
         'core/fpdfdoc/doc_ocg.cpp',
         'core/fpdfdoc/doc_utils.cpp',
         'core/fpdfdoc/doc_utils.h',
-        'core/fpdfdoc/doc_viewerPreferences.cpp',
         'core/fpdfdoc/doc_vt.cpp',
         'core/fpdfdoc/include/cpdf_aaction.h',
         'core/fpdfdoc/include/cpdf_action.h',