Add XFA BMP pixel test

This adds a test case where a simple red square BMP image is embedded
into an XFA document. This exercises that <image> tags work correctly
and that end to end rendering of BMPs is working.

Displaying BMPs is currently broken, https://crbug.com/pdfium/1168, so
this test is currently suppressed.

BUG=pdfium:1163

Change-Id: I3ef006a7aa16717ad9cdbca1d423613f17246a5e
Reviewed-on: https://pdfium-review.googlesource.com/43132
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index e7e1ebd..4720505 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -329,8 +329,11 @@
 
 # TODO(pdfium:1107): Remove after associated bug is fixed
 standard_symbols.pdf * * *
+# TODO(pdfium:1168): Remove after associated bug is fixed
+xfa_bmp_image.in * * *
 # TODO(pdfium:1095): Remove after associated bug is fixed
 xfa_example.in win * *
-xfa_textfield.in win * *
 # TODO(pdfium:1167): Remove after associated bug is fixed
-xfa_gif_image.in * * *
\ No newline at end of file
+xfa_gif_image.in * * *
+# TODO(pdfium:1095): Remove after associated bug is fixed
+xfa_textfield.in win * *