Bundle pepper PDF plugin on all platforms (issue #1331).

- Add new libpdf.so library on Linux and PDF.plugin app bundle on OS X.
- Move scaled resources from cef.pak into separate cef_100_percent.pak and cef_200_percent.pak files.
- Password-protected PDF files are not currently supported.
- No fallback is provided for PDF files that contain unsupported features.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1758 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/renderer/content_renderer_client.h

@@ -93,6 +93,8 @@ class CefContentRendererClient : public content::ContentRendererClient,
                                       v8::Handle<v8::Context> context,
                                       int extension_group,
                                       int world_id) OVERRIDE;
+  virtual const void* CreatePPAPIInterface(
+      const std::string& interface_name) OVERRIDE;
 
   void WillReleaseScriptContext(blink::WebFrame* frame,
                                 v8::Handle<v8::Context> context,