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

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