Make FPDFBitmap_GetFormat() work for JBIG images.

BUG=pdfium:945

Change-Id: I2a880e747b6f5a2fabed4d34ce47b69ff589ce3f
Reviewed-on: https://pdfium-review.googlesource.com/27814
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/fpdfsdk/fpdfedit_embeddertest.cpp b/fpdfsdk/fpdfedit_embeddertest.cpp
index 8754a66..3fc6cae 100644
--- a/fpdfsdk/fpdfedit_embeddertest.cpp
+++ b/fpdfsdk/fpdfedit_embeddertest.cpp
@@ -1131,12 +1131,11 @@
   FPDF_PAGEOBJECT obj = FPDFPage_GetObject(page, 0);
   ASSERT_EQ(FPDF_PAGEOBJ_IMAGE, FPDFPageObj_GetType(obj));
   {
-    // TODO(bug_945): This should return a valid bitmap. This test should be
-    // able to successfully check |bitmap| using FPDFBitmap_GetFormat() and
-    // CompareBitmap().
     std::unique_ptr<void, FPDFBitmapDeleter> bitmap(
         FPDFImageObj_GetBitmap(obj));
-    ASSERT_FALSE(bitmap);
+    ASSERT_TRUE(bitmap);
+    EXPECT_EQ(FPDFBitmap_Gray, FPDFBitmap_GetFormat(bitmap.get()));
+    CompareBitmap(bitmap.get(), 1152, 720, "3f6a48e2b3e91b799bf34567f55cb4de");
   }
 
   UnloadPage(page);