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..af0e2dff11c811514f46c5d6be5309f9c7cf8cbf 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -3384,4 +3384,24 @@ 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 ret_value = false;
+
+  if (!doc)
+    return ret_value;
+
+  if (FPDF_GetPageSizeByIndex(doc, index, width, height))
+    ret_value = true;
+
+  FPDF_CloseDocument(doc);
+
+  return ret_value;
+}
+
 }  // namespace chrome_pdf