athena: Add support for PDF

athena/main/athena_renderer_pdf_helper.h

Index: athena/main/athena_renderer_pdf_helper.h
diff --git a/athena/main/athena_renderer_pdf_helper.h b/athena/main/athena_renderer_pdf_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..2521985743f5808ab081338e7a900526992a8ba6
--- /dev/null
+++ b/athena/main/athena_renderer_pdf_helper.h
@@ -0,0 +1,27 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATHENA_MAIN_ATHENA_RENDERER_PDF_HELPER_H_
+#define ATHENA_MAIN_ATHENA_RENDERER_PDF_HELPER_H_
+
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace athena {
+
+class AthenaRendererPDFHelper : public content::RenderFrameObserver {
+ public:
+  explicit AthenaRendererPDFHelper(content::RenderFrame* frame);
+  virtual ~AthenaRendererPDFHelper();
+
+ private:
+  // RenderFrameObserver:
+  virtual void DidCreatePepperPlugin(
+      content::RendererPpapiHost* host) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(AthenaRendererPDFHelper);
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_MAIN_ATHENA_RENDERER_PDF_HELPER_H_