Add some files to the C compilation test, and fix some stuff that wasn't C com...

ppapi/c/private/ppb_pdf.h

 // Copyright (c) 2011 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 PPAPI_C_PRIVATE_PPB_PDF_H_
 #define PPAPI_C_PRIVATE_PPB_PDF_H_
 
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
@@ skipping 64 matching lines @@
   bool italic;
 };
 
 struct PP_PrivateFindResult {
   int start_index;
   int length;
 };
 
 struct PPB_PDF {
   // Returns a localized string.
-  PP_Var (*GetLocalizedString)(PP_Instance instance,
-                               PP_ResourceString string_id);
+  struct PP_Var (*GetLocalizedString)(PP_Instance instance,
+                                      PP_ResourceString string_id);
 
   // Returns a resource image.
   PP_Resource (*GetResourceImage)(PP_Instance instance,
                                   PP_ResourceImage image_id);
 
   // Returns a resource identifying a font file corresponding to the given font
   // request after applying the browser-specific fallback.
   //
   // Currently Linux-only.
   PP_Resource (*GetFontFileWithFallback)(
       PP_Instance instance,
-      const PP_FontDescription_Dev* description,
+      const struct PP_FontDescription_Dev* description,
       PP_PrivateFontCharset charset);
 
   // Given a resource previously returned by GetFontFileWithFallback, returns
   // a pointer to the requested font table. Linux only.
   bool (*GetFontTableForPrivateFontFile)(PP_Resource font_file,
                                          uint32_t table,
                                          void* output,
                                          uint32_t* output_length);
 
   // Search the given string using ICU.  Use PPB_Core's MemFree on results when
   // done.
   void (*SearchString)(
      PP_Instance instance,
      const unsigned short* string,
      const unsigned short* term,
      bool case_sensitive,
-     PP_PrivateFindResult** results,
+     struct PP_PrivateFindResult** results,
      int* count);
 
   // Since WebFrame doesn't know about PPAPI requests, it'll think the page has
   // finished loading even if there are outstanding requests by the plugin.
   // Take this out once WebFrame knows about requests by PPAPI plugins.
   void (*DidStartLoading)(PP_Instance instance);
   void (*DidStopLoading)(PP_Instance instance);
 
   // Sets content restriction for a full-page plugin (i.e. can't copy/print).
   // The value is a bitfield of ContentRestriction enums.
   void (*SetContentRestriction)(PP_Instance instance, int restrictions);
 
   // Use UMA so we know average pdf page count.
   void (*HistogramPDFPageCount)(int count);
 
   // Notifies the browser that the given action has been performed.
-  void (*UserMetricsRecordAction)(PP_Var action);
+  void (*UserMetricsRecordAction)(struct PP_Var action);
 
   // Notifies the browser that the PDF has an unsupported feature.
   void (*HasUnsupportedFeature)(PP_Instance instance);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_PDF_H_