Print Preview: Detecting plugin existence before generating the preview.

chrome/browser/ui/webui/print_preview_ui_html_source.cc

Index: chrome/browser/ui/webui/print_preview_ui_html_source.cc
diff --git a/chrome/browser/ui/webui/print_preview_ui_html_source.cc b/chrome/browser/ui/webui/print_preview_ui_html_source.cc
index be4b583b5190583bb94e9ab2cc247e53f21d8651..e4ea838a29ca9979dae87eec84430d3cb188d879 100644
--- a/chrome/browser/ui/webui/print_preview_ui_html_source.cc
+++ b/chrome/browser/ui/webui/print_preview_ui_html_source.cc
@@ -160,6 +160,18 @@ void PrintPreviewUIHTMLSource::StartDataRequest(const std::string& path,
       *it = *(preview_data + i);
     SendResponse(request_id, html_bytes);
     return;
+  } else if (path == "blank.pdf") {
+    const unsigned char blank_pdf[] = "%PDF-1.4\n3 0 obj<</Type/Catalog/Pages"

[vandebo (ex-Chrome), 2011/05/11 22:13:54]

kBlankPDF
All the start quotes should line up.

[dpapad, 2011/05/11 23:31:03]

It seems like there is no need to pass actual pdf data. Passing no data works
just as well.

+        " 1 0 R>>endobj 2 0 obj<</Type/Page/Parent 1 0 R/Resources"
+        "<<>>/MediaBox[0 0 612 792]>>endobj 1 0 obj<</Type"
+        "/Pages/Kids[2 0 R]/Count 1>>endobj\nxref\n0 4\n"
+        "0000000000 65535 f \n0000000129 00000 n \n"
+        "0000000052 00000 n \n0000000009 00000 n \ntrailer<<"
+        "/Size 4/Root 3 0 R>>startxref\n178\n%%EOF\n";
+    scoped_refptr<RefCountedStaticMemory> dummy_bytes(

[vandebo (ex-Chrome), 2011/05/11 22:13:54]

dummy_bytes -> blank_bytes.

[dpapad, 2011/05/11 23:31:03]

Done.

+        new RefCountedStaticMemory(blank_pdf, sizeof(blank_pdf)));
+    SendResponse(request_id, dummy_bytes);
+    return;
   } else {
     // Invalid request.
     scoped_refptr<RefCountedBytes> empty_bytes(new RefCountedBytes);