Open FPDF_PAGEOBJECTMARK API.

Initially it contains:
- FPDFPageObj_CountMarks
- FPDFPageObj_GetMark
- FPDFPageObjMark_GetName

This allows reading the content marks from a page object.

Bug: pdfium:1037
Change-Id: I3d7554b71f938778890fdb44088e0d45dd2718d9
Reviewed-on: https://pdfium-review.googlesource.com/28710
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 136 insertions, 0 deletions

diff --git a/testing/resources/text_in_page_marked.in b/testing/resources/text_in_page_marked.in
new file mode 100644
index 0000000000..e2387a440c
--- /dev/null
+++ b/testing/resources/text_in_page_marked.in
@@ -0,0 +1,136 @@
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