Fix Jbig2 document context creation by checking proper pointer

core/fxcodec/codec/fx_codec_embeddertest.cpp

Index: core/fxcodec/codec/fx_codec_embeddertest.cpp
diff --git a/core/fxge/ge/fx_ge_text_embeddertest.cpp b/core/fxcodec/codec/fx_codec_embeddertest.cpp
similarity index 63%
copy from core/fxge/ge/fx_ge_text_embeddertest.cpp
copy to core/fxcodec/codec/fx_codec_embeddertest.cpp
index 045b6dc8690cbcfe36c0a4d98b9259a2d96c0113..441494c0e6c4449b9df4bd0675e11058ad060219 100644
--- a/core/fxge/ge/fx_ge_text_embeddertest.cpp
+++ b/core/fxcodec/codec/fx_codec_embeddertest.cpp
@@ -5,11 +5,12 @@
 #include "testing/embedder_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-class FXGETextEmbedderTest : public EmbedderTest {};
+class FXCodecEmbeddertest : public EmbedderTest {};
 
-TEST_F(FXGETextEmbedderTest, BadItalic) {
-  // Shouldn't crash.
-  EXPECT_TRUE(OpenDocument("bug_601362.pdf"));
+TEST_F(FXCodecEmbeddertest, Bug_631912) {
+  // Test jbig2 image in PDF file can be loaded successfully.
+  // Should not crash.
+  EXPECT_TRUE(OpenDocument("bug_631912.pdf"));
   FPDF_PAGE page = LoadPage(0);
   EXPECT_NE(nullptr, page);
   FPDF_BITMAP bitmap = RenderPage(page);