Added a test that currently is able to print to pdf.

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 45651319d29051a840585cdc2076b9e225458e68..a72c410240f266c5fe06981efac188ea0149bf32 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -3384,4 +3384,19 @@ bool PDFiumEngineExports::GetPDFDocInfo(const void* pdf_buffer,
   return true;
 }
 
+bool PDFiumEngineExports::GetPDFPageSizeByIndex(
+    const void* pdf_buffer,
+    int buffer_size,
+    int index,
+    double* width,
+    double* height) {
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
+  bool success = false;
+  if (!doc)
+    return success;
+  success = FPDF_GetPageSizeByIndex(doc, index, width, height) != 0;
+  FPDF_CloseDocument(doc);
+  return success;
+}
+
 }  // namespace chrome_pdf