pdf: Move PepperPDFHost into the pdf component.

components/pdf/renderer/ppb_pdf_impl.h

 // 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 COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_
 #define COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_
 
 #include "ppapi/c/pp_instance.h"
 
 struct PPB_PDF;
 
 namespace pdf {
 
 class PPB_PDF_Impl {
  public:
   class PrintClient {
    public:
     virtual ~PrintClient() {}
 
     // Returns whether printing is enabled for the plugin instance identified by
     // |instance_id|.
     virtual bool IsPrintingEnabled(PP_Instance instance_id) = 0;
 
     // Invokes the "Print" command for the plugin instance identified by
-    // |instance_id|.
-    virtual void Print(PP_Instance instance_id) = 0;
+    // |instance_id|. Returns whether the "Print" command was issued or not.
+    virtual bool Print(PP_Instance instance_id) = 0;
   };
 
   // Returns a pointer to the interface implementing PPB_PDF that is exposed
   // to the plugin.
   static const PPB_PDF* GetInterface();
 
   // Invokes the "Print" command for the given instance as if the user right
-  // clicked on it and selected "Print".
-  static void InvokePrintingForInstance(PP_Instance instance);
+  // clicked on it and selected "Print". Returns if the "Print" command was
+  // issued or not.
+  static bool InvokePrintingForInstance(PP_Instance instance);
 
   // The caller retains the ownership of |print_client|. The client is
   // allowed to be set only once, and when set, the client must outlive the
   // PPB_PDF_Impl instance.
   static void SetPrintClient(PrintClient* print_client);
 };
 
 }  // namespace pdf
 
 #endif  // COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_