Move CPDF_GraphState to CFX_GraphState

The FX layer is spying on its private data, so make the job
of ref-counting it live in FX as well, instead of up a layer
at pdfapi.

Pre-cursor to making this private and passing the graph
state itself everywhere.

Review-Url: https://codereview.chromium.org/2314223002
diff --git a/BUILD.gn b/BUILD.gn
index 0553f8b..1223ef6 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -422,8 +422,6 @@
     "core/fpdfapi/fpdf_page/cpdf_generalstate.cpp",
     "core/fpdfapi/fpdf_page/cpdf_graphicstates.cpp",
     "core/fpdfapi/fpdf_page/cpdf_graphicstates.h",
-    "core/fpdfapi/fpdf_page/cpdf_graphstate.cpp",
-    "core/fpdfapi/fpdf_page/cpdf_graphstate.h",
     "core/fpdfapi/fpdf_page/cpdf_image.cpp",
     "core/fpdfapi/fpdf_page/cpdf_imageobject.cpp",
     "core/fpdfapi/fpdf_page/cpdf_meshstream.cpp",
@@ -766,6 +764,7 @@
     "core/fxge/ge/cfx_fontmapper.cpp",
     "core/fxge/ge/cfx_fontmgr.cpp",
     "core/fxge/ge/cfx_gemodule.cpp",
+    "core/fxge/ge/cfx_graphstate.cpp",
     "core/fxge/ge/cfx_graphstatedata.cpp",
     "core/fxge/ge/cfx_pathdata.cpp",
     "core/fxge/ge/cfx_renderdevice.cpp",
@@ -785,6 +784,7 @@
     "core/fxge/include/cfx_fontmgr.h",
     "core/fxge/include/cfx_fxgedevice.h",
     "core/fxge/include/cfx_gemodule.h",
+    "core/fxge/include/cfx_graphstate.h",
     "core/fxge/include/cfx_graphstatedata.h",
     "core/fxge/include/cfx_pathdata.h",
     "core/fxge/include/cfx_renderdevice.h",