Export a function from the PDF plugin to get the dimensions of a PDF page.

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 c1203bb74bca41fc65c6d15fc0eb80c4867dd07c..e66c12a6c9f1177247eed5f905e87412dbfddb8f 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -3406,4 +3406,18 @@ bool PDFiumEngineExports::GetPDFDocInfo(const void* pdf_buffer,
   return true;
 }
 
+bool PDFiumEngineExports::GetPDFPageSizeByIndex(
+    const void* pdf_buffer,
+    int pdf_buffer_size,
+    int page_number,
+    double* width,
+    double* height) {
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
+  if (!doc)
+    return false;
+  bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
+  FPDF_CloseDocument(doc);
+  return success;
+}
+
 }  // namespace chrome_pdf