Extend pdfium_test capability so that more Javascript can be executedchromium/2841

In [1], the lack of support of pdfium_test to some application
level hooks was felt.
More specifically, the lack of implementation of the hook FFI_GetPage,
called  when 'this.getAnnot()' is executed in an Acrobar JS context,
makes it non-trivial to JS texts that manipulate PDF annotations.

[1] https://codereview.chromium.org/2265313002/

Here is the failing call stack in pdfium_test:

0 ::RenderPdf                              (samples/pdfium_test.cc)
1 ::FORM_DoDocumentOpenAction              (fpdfsdk/fpdfformfill.cpp)
2 CPDFSDK_Document::ProcOpenAction         (fpdfsdk/fsdk_mgr.cpp)
3 CPDFSDK_ActionHandler::DoAction_DocOpen  (fpdfsdk/fsdk_actionhandler.cpp)
  <----v8---->
4 Document::getAnnot                       (fpdfsdk/javascript/Document.cpp)
5 CPDFSDK_Document::GetPageView            (fpdfsdk/fsdk_mgr.cpp)
6 CPDFDoc_Environment::FFI_GetPage         (fpdfsdk/include/fsdk_mgr.h)

(frame 6 returns nullptr, and getAnnot call in frame 4 bails)

CL extends pdfium_test app with a FFI_GetPage hook implementation.

Basically what FFI_GetPage does is returning a FPDF_PAGE instance.
In case of pdfium_test, FPDF_PAGE instances were only created on demand
when the page was going to get rendered, and then discarded.

Since FFI_GetPage can be called by JS before pages are rendered,
CL moved the page creation code into a helper function, and cached
the FPDF_PAGE instances created in a map, so it does not recreate
them needlessly.

BUG=pdfium:492

Review-Url: https://codereview.chromium.org/2277063003

2 files changed, 520 insertions, 0 deletions

diff --git a/testing/resources/pixel/bug_492.pdf b/testing/resources/pixel/bug_492.pdf
new file mode 100644
index 0000000000..3a6486d32f
--- /dev/null
+++ b/testing/resources/pixel/bug_492.pdf
@@ -0,0 +1,520 @@
+%PDF-1.3
+%����
+1 0 obj
+<< /Pages 3 0 R /Type /Catalog /OpenAction 5 0 R >>
+endobj
+3 0 obj
+<< /Count 1 /Kids [ 8 0 R ] /MediaBox [ 0 0 612 792 ] /Type /Pages >>
+endobj
+5 0 obj
+<<
+/Type /Action
+/S /JavaScript
+/JS (
+  var a = this.getAnnot(0, "Annot-1");
+  if ( a != null )
+    a.hidden = false;
+)
+>>
+endobj
+8 0 obj
+<< /Annots 9 0 R /Contents 10 0 R /MediaBox [ 0 0 612 792 ] /Parent 3 0 R /Resources 11 0 R /Rotate 0 /Type /Page >>
+endobj
+9 0 obj
+[ 12 0 R ]
+endobj
+10 0 obj
+<< /Length 16091 >>
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