Implement the host side of the PPB_PDF proxy.

chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc

Index: chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc
diff --git a/chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc b/chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc
index 6cd35e81e5219e5d16299a1aaab0d28ee1ef0b43..d96000e3cac75fb7ea5b7ba4fe44893aece433ad 100644
--- a/chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc
+++ b/chrome/renderer/pepper/chrome_renderer_pepper_host_factory.cc
@@ -10,6 +10,7 @@
 #include "chrome/renderer/pepper/pepper_flash_fullscreen_host.h"
 #include "chrome/renderer/pepper/pepper_flash_menu_host.h"
 #include "chrome/renderer/pepper/pepper_flash_renderer_host.h"
+#include "chrome/renderer/pepper/pepper_pdf_host.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/host/resource_host.h"
@@ -96,6 +97,16 @@ ChromeRendererPepperHostFactory::CreateResourceHost(
     }
   }
 
+  if (host_->GetPpapiHost()->permissions().HasPermission(
+      ppapi::PERMISSION_PRIVATE)) {
+    switch (message.type()) {
+      case PpapiHostMsg_PDF_Create::ID: {
+        return scoped_ptr<ResourceHost>(new PepperPDFHost(
+            host_, instance, params.pp_resource()));
+      }
+    }
+  }
+
   return scoped_ptr<ResourceHost>();
 }