Command line switch to disable GView PDF handling.

chrome/browser/chromeos/gview_request_interceptor.cc

 // Copyright (c) 2009 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.
 
 #include "chrome/browser/chromeos/gview_request_interceptor.h"
 
+#include "base/file_path.h"
+#include "base/path_service.h"
+#include "chrome/common/chrome_paths.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_request_job.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_redirect_job.h"
 #include "googleurl/src/gurl.h"
+#include "webkit/glue/plugins/plugin_list.h"
 
 namespace chromeos {
 
+// The PDF mime type is treated special if the browser has a built-in
+// PDF viewer plug-in installed - we want to intercept only if we're
+// told to.
+static const char* const kPdfMimeType = "application/pdf";
+
 // This is the list of mime types currently supported by the Google
 // Document Viewer.
 static const char* const supported_mime_type_list[] = {
-  "application/pdf",
+  kPdfMimeType,
   "application/vnd.ms-powerpoint"
 };
 
 static const char* const kGViewUrlPrefix = "http://docs.google.com/gview?url=";
 
 GViewRequestInterceptor::GViewRequestInterceptor() {
   URLRequest::RegisterRequestInterceptor(this);
   for (size_t i = 0; i < arraysize(supported_mime_type_list); ++i) {
     supported_mime_types_.insert(supported_mime_type_list[i]);
   }
@@ skipping 11 matching lines @@
 
 URLRequestJob* GViewRequestInterceptor::MaybeInterceptResponse(
     URLRequest* request) {
   // Do not intercept this request if it is a download.
   if (request->load_flags() & net::LOAD_IS_DOWNLOAD) {
     return NULL;
   }
 
   std::string mime_type;
   request->GetMimeType(&mime_type);
+  // If the local PDF viewing plug-in is installed and enabled, don't
+  // redirect PDF files to Google Document Viewer.
+  if (mime_type == kPdfMimeType) {
+    FilePath pdf_path;
+    WebPluginInfo info;
+    PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_path);
+    if (NPAPI::PluginList::Singleton()->GetPluginInfoByPath(pdf_path, &info) &&
+        info.enabled)
+      return NULL;
+  }
   // If supported, build the URL to the Google Document Viewer
   // including the origial document's URL, then create a new job that
   // will redirect the browser to this new URL.
   if (supported_mime_types_.count(mime_type) > 0) {
     std::string url(kGViewUrlPrefix);
     url += EscapePath(request->url().spec());
     return new URLRequestRedirectJob(request, GURL(url));
   }
   return NULL;
 }
 
 URLRequest::Interceptor* GViewRequestInterceptor::GetGViewRequestInterceptor() {
   return Singleton<GViewRequestInterceptor>::get();
 }
 
 }  // namespace chromeos